My Favorite: Delta Math

Edited:  I finally updated my Delta Math post.  I love having a website that helps my students AND is so good that THEY ask me for it.  It’s the best!  Enjoy! 

We are now into Week 2 of the Blogging Initiative, “My Favorite”!  You should definitely check it out if you would like some blogging inspiration!  It is only four posts and it’s not to late to join in.

Screen Shot 2017-05-21 at 6.50.12 PMMy favorite for the week is Delta Math, a free online math practice program with problems ranging from middle school to pre-calculus. The amazing Mattie Baker presented Delta Math as one of his favorites at TMC15 last summer.  You can watch his presentation at the bottom of this post.

I rarely use Delta Math for daily homework assignments.  Instead, I use it to review those basic Algebra 1 skills that many students have either forgotten or did not master during their Algebra 1 year.  I give these basic practice sets well in advance of the corresponding Algebra 2 topic that I will be covering in order to get them prepared.  I assign one “Problem Set” of about 5 – 10 problems a week.  I also give a variety of problem types in the problem sets.  Students are able to rework each problem until they get it correct, meaning that they are able to receive full credit on their problem set each week with just effort.

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The students can see fully worked out examples of each problem and even watch videos for some problem sets.

Screen Shot 2017-05-21 at 6.46.14 PMI love the explanations on Delta Math, as they usually use methods that I teach in class, like the “box method” for multiplying polynomials.  They even color coded the diagonals!

Occasionally I will assign a Delta Math set for homework.  For instance, they have some fantastic practice sets for graphs, such as the one for finding domain and range visually.

Delta Math gives you amazing student data.  You can see which problems students missed and even their incorrect answers.  If I see many students struggling on a set, then I will usually reassign that set in the coming weeks.  You can even see how long students took on EACH problem!



How I Use Delta Math:

  1. I assign about 10 review problems per week, due every Tuesday at 8:00 AM.*
  2. I usually require 1-2 of each kind of problem, with a “1 off” designation.  This means that they can miss one problem without penalty, but if they miss more than one in a row, they go back to zero.
  3. I assign Algebra 1 problems well in advance of the corresponding Algebra 2 topic.
  4. I assign problems on a spiraling basis where problems increase in difficulty each week.  I am staring rational functions in about a month, so next week I will start assigning them basic fraction problems.  Next, I will assign them fraction problems with x in them,…
  5. I hold help sessions the day before their problem sets are due for my students that struggle recalling their Algebra 1 skills.

*This biggest drawback is that students forget to do their Delta Math since it is an online program and only assigned and checked once a week.  Moving the due date from Monday to Tuesday helped tremendously with this.  I also love the Tuesday due date as opposed to Friday as some students wait until the last day to complete it and they are usually pretty wiped out by Thursday night.  I use Remind to remind them and mention it in class.

Optional Summer Assignment:

Another way I use Delta Math is that I give all rising Algebra 2 students at our school an optional summer assignment on Algebra 1 topics in order to help them refresh their basic skills.  I assign just one question per topic, but students can do as many questions as they like.

Zach Korzyk (@MrDeltaMath), the creator of Delta Math, is a great person to follow on Twitter because he loves to help teachers!  Follow him and say “Hi!”.

Mattie (@stoodle) – Thank you for introducing me to Delta Math!  (Delta Math portion begins at about 3:00)

Click here for video.

My students really love Delta Math!  Here is some of what they said in my last course survey. 

  • Having Delta Math for homework helped me a lot because it showed me how to do the problems so that when I did a problem similar to the previous, I would know how to do it with a lot more confidence.
  • Start doing more Delta Math.
  • Do More Delta Maths.
  • Do Delta Math – It helps a lot!
  • Do the Delta Math (this will definitely help)!!
  • Delta Math was very helpful.
  • Please give more Delta Math assignments.
  • I think continuing to assign Delta Math would be wise.
  • Delta Math really helped when it gave examples.
  • Please start doing Delta Math more. 
  • Delta Math assignments, they helped me a lot!

TinyScan – PDF Scanner App for Smartphones and iPad

IMG_6195I have been using an amazing app that I really don’t know how I lived without called TinyScan.  Holy mac, this app is a teachers dream!  There is a free version which I tried first.  But, I quickly upgraded to the premium version for $4.99.

With TinyScan you take a picture of something with your phone (for me, it is usually the worked out solutions to homework), take a picture of the page, then TinyScan beautifully turns it into a crisp and clear pdf file.  You can edit, crop, and rotate the file.  You can make it black and white or color and darken or lighten the ink.  You can take pictures of several pages in one file (you may have to have the premium version for batch scanning documents into one file).  Once you have edited your pdf, you can email, AirPrint or fax the pdf’s with one click.  The very best part is that you can instantly upload the pdf to your Google Drive from within the app!  You can also set the app to instantly upload to Google Drive (or other services).  To do this, go to settings and choose Auto Upload, and you can choose from Google Drive, Dropbox, Evernote, Box or OneDrive.  It’s so easy!

The best way that I use it is by uploading the files to my Google Drive.  I created a shared student folder on Google Drive, so as soon as I finish the key I can take a picture of it and upload it to the student file so that my students have immediate access.  I also take a quick picture of all of my test keys and keep them in the same folder as the original in case I lose the key.  I love this app.

Glenn showed me a couple of different scanning apps at TMC15.  His apps were able to rotate a picture automatically if you took it crooked.  However, he could not automatically upload to Google Drive.  So if you look at a different scan app, make sure you can seamlessly upload to Google Drive if that is important to you.

Fill Out This Form to Connect With Other Math Teachers On Kahoot!

There are thousands of public Kahoots! made by teachers to chose from.  Kahoot! has a search feature that allows you to search by title, subject, tag, or username.  You can also share a Kahoot! that you have made with another teacher if you know their username.

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Since my Kahoot! post, I have found that many math teachers that I know also use Kahoot! and are using it in ways that I have not even thought of.  For instance, Laura Wheeler uses Kahoot! a few times a week as a warm up for a fun way to do spiraling reviews.  I would love to easily find and see her reviews, since we both teach high school math.

Then, as is often the case, an amazing idea was born on Twitter.  Wouldn’t it be GREAT if we knew our math teacher friends Kahoot! user names?  Then, we could search and share with teachers that we know.  Additionally, if teachers would tag the Kahoots! they use with MTBoS, we could also search that way.

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Sharing your Kahoot!

So, please fill out this form if you are interested in easily sharing the Kahoots! that you create and use with other math teachers.  I asked for the subjects you teach so that other teachers can more easily find teachers that have similar needs.  And don’t worry if you don’t make your own Kahoots!  I rarely make Kahoots! from scratch.  But, I do go through each Kahoot! I use carefully, and often edit them, so other teachers would probably benefit from the Kahoots! that I use.  If you are not already using Kahoot!, you need to sign up for a free Kahoot! account here to get your username.

Here are the results: Google Form of MTBoS Kahoot! user names.

Once you finish the form, you will be directed to a Google Form of MTBoS Kahoot! user names.

How to Search and Add Tags in Kahoot!

Also, to search by tag, you can’t just enter mtbos.  You have to type in doc.tags:mtbos.

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Don’t forget to tag your Kahoot! with MTBoS after you finish making it.

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Fill out this form to connect with other math teachers on Kahoot!

Fill out this form to connect with other math teachers on Kahoot!

You Have To Try Kahoot! For Engagement

Moving from middle school to high school this year was an enthusiasm culture shock. For example, in middle school, I had to use Popsicle sticks to limit student participation in class. Many middle school students wanted to answer every question, and I wanted everyone to have a chance to participate.  In high school, I had to use Popsicle sticks in order to encourage student participation. Silence can be deafening, especially at the beginning of the year and always on Mondays.

I do not prefer a silent classroom on a daily basis. I  also prefer that my students talk more than me. So, since my move to high school, I have been endlessly searching for activities that engaged everyone WHILE they were doing math. I tried games, stations, trasketball, speed dating, group work on big white boards, gallery walks, tinker toys, conic cards, Nearpod, Plickers, CANDY and just about anything else you can think of this year to get high school kids ENGAGED and EXCITED (about math work).  While they have liked many of my crazy activities this year, they did not love anything until Kahoot!

Playing Kahoot is the most fun I have had in my classroom in AGES.  Kahoot! is an online multiple choice game where students play against their classmates. I project the questions from my computer, and they select from four choices on their device. Students can use iPhones, iPads, or a computer. Students can also work together and share devices if they do not have enough individual devices. They do not see the question on their device, only the answer choice. As students answer a visual timer counts down and the number of students that have answered pop up on the overhead screen.  To increase the excitement, you can also chose to play KaHoots jeopardy sounding music.

Students get points for getting the correct answer, and even more points if they answer the question more quickly than their classmates. The top 5 students are listed on a “Leaderboard” after each question to keep the competition HOT.

The kids love playing Kahoot! They love playing it so much that I often have my students that aren’t even in the current period join my class during their study hall periods!  Students in class have tweeted and texted out the game code. I even noticed a kid playing through the glass window of my door one day.  Of course I took a picture.

Other than all of the fun for the kids, the best part for ME is that I NEVER HAVE TO MAKE MY OWN KAHOOT.  There are thousands of Kahoots! already made by excellent math teachers everywhere. This is KEY when you have a new planning or are simply overwhelmed. You just type in your topic and then can chose from dozens of premade Kahoots! on just about any topic, including Calculus!

The biggest downside to Kahoot is that the kids want to play it all of the time and beg me daily to play it.

Suggestions for fun and productive Kahooting:

  1. Don’t make your own Kahoot at first. In fact, I may never make my own. There are so many to borrow from!  Once you duplicate a Kahoot, it is easy to edit.
  2. When playing Kahoot, 6 – 10 questions is best. Some kids get discouraged and give up if they fall too behind in the scores. So, instead if playing one KaHoot game with 20 questions, play two 10 question Kahoots! You will have two winners and thus more opportunities to get everyone engaged.
  3. I use Kahoot! as a pretest, for a quick check of their understanding of terms. and as practice problems for more rote  or basic topics. The max time students have to answer a question is 120 seconds so KaHoot is not for problems that take a longer time to solve.
  4. Let them make up silly names. I play Kahoot! so they can have fun while doing math. And making up silly names is really a big part of this fun.

You can also embed YouTube videos into KaHoot. I videoed the kids one day and posted it to YouTube, then added it to their next KaHoot game. The next time we played, their video was what played while they were signing in. They loved it. 

Watch the action here. 

I have just learned about a Ghost Mode in KaHoot but haven’t had a chance to try it yet. Cathy Yeneka blogged about Ghost Mode. I can’t wait to try it in the fall!

Plickers aka “Can We Do This All Period?”

If you want 100% of your students engaged and asking you to do an activity, you need to try Plickers.

photoThe amazing Pam Wilson introduced us to them at Twitter Math Camp.  We were ALL amazed and impressed!

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A Plicker is a “paper clicker” with a bar code that the students hold up and then you scan with any smartphone or iPad.  Only one device needed, no batteries required!  The students can pick A, B, C, D or True/False.  The data immediately shows up on your phone AND on their website as a bar graph.  I assigned my students a number, so I can even see who missed the question as I am scanning the room.

From your computer, you can project their responses onto your overhead.  It only shows the correct responses in the “Live View”.

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It also stores the data on their website so you have a record of correct and incorrect answers.  I know you think that I must be lying, but I am not.  These things are AMAZING.

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I decided to affix my students Plickers to the back of their INB with clear contact paper.  That way, they should always have them handy during class, and hopefully they won’t get destroyed!  I oriented them all differently (either A, B, C, or D facing up) on their notebooks so they couldn’t see how other students were holding up their notebooks to get a hint.  It’s so much fun for the students and for me!

I have been using it as a warm-up, to asses prior knowledge or expose them to a new topic that we will begin that day.  I think it would also be a great “Pre-Assessment” or “Exit Ticket” tool.

You can see below how other teachers are using them in class as well.  If you have an idea about how Plickers could be used, please put it in the comments.  Also, if you have blogged about Plickers, please post your link in the comments so that we can all get great new ideas!

Paper Airplanes for Measures of Central Tendencies

IMG_6886I got this amazing idea from Bruno Reddy, @MrReddyMaths.  Go and read his post here. I love his discussion about mean and deciding who should win!  When I saw his post I knew it would be fun.  I planned on using the data to calculate mean, median, and mode.  However, I did not realize how much mileage I would get out of this one activity!  I pretty much teach the entire data chapter using just the data from this one activity.

I have my students watch the “How to Make a Paper Airplane” video and give them the template.  I do not give them any instructions and do not allow them to help each other.  Following directions is always a skill I am trying to teach 6th graders.

After we make the airplanes, we get to fly them!  Of course, I make it a competition. And of course, I video it!

Everyone gets a partner, to help with measuring, and three attempts at the best flight!  Student’s whose planes fly backward get to record NEGATIVE flights.  All three flights are recorded and then entered into a Google Form.  For homework that night, they had to find the mean of their three flights.

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Line Plots and Scale:

I have students make a line plot out of all three entries.  This year, I only had 21 students, so this is 63 entries.  This is a great time to talk about scale.   I have them record their distances in inches, but then they quickly realize that it is a much better idea to make the line plot using feet.  We find the mean, median, and mode of our data using our line plot.



Range is one of my favorites here, especially with the inclusion of the negative flights.  This year, our flights ranged from about -300″ to 600″.  Predictably, almost all students told me that the range was 300″.  Students love plugging values into formulas incorrectly.  To help correct this misunderstanding, I had my -300″ flight student and my 600″ flight student come to the front of the room.  I stood at the starting point (the edge of the blacktop for us, also known as 0) and had them stand where their respective planes had landed.  Students immediately not only saw that 300″ was way off, but they saw why.  This was a wonderful opportunity to show them that 600 – (-300) was indeed 900″, not 300″.  My analogy to help deepen understanding was, “You leave from Charlotte to fly to New York, but you have a layover in Atlanta first”!  Nothing is ever better than visual learning and real life examples.

Box Plots:

The next day we learned about box plots.  I project the line plot of our flight data and as a class we make it into a box plot.  They loved seeing that a box plot can helpfully catagorize  their data.  Outliers are visual here, as well as where 50% of their flights landed.  Next year I am going to take a picture of their airplanes laying on the blacktop to back this statistic up visually.


I also had the students create a box plot of their mean flight data.  They wrote their mean flight length (in feet) on a sheet of 8×11.5 paper.  Then, they organized themselves into a human box and whiskers plot.  The students who were the lower and upper extremes, Q1, Q3, and median all held index cards with the name on them.  We also decided who was in our interquartile range.


The line plot looks very much like a bar graph.  After a very brief explanation about histograms, we turn our line graph into a histogram.  The students love seeing their data grouped and of course ask why we didn’t do this in the FIRST place instead of making the tedious line plot.  It’s all for the sake of learning.  (Insert evil teacher smile.)

Google Doc Data:

I shared the data with the students and we then all made bar graphs and histograms on Google Spreadsheets.  The students like the histograms better as it condensed the data into groups.  They also learned how to sort the data and find the mean using a formula.  Again, they love finding the mean using spreadsheet formulas, find it less “mean” than calculating it by hand, and call me a “mean” teacher for not showing them this in the first place!  Practice makes perfect.

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Global Math Webinar – March 4: Student Creativity in Math with Technology

Don’t miss Global Math this Tuesday night, March 4th, Student Creativity in Math with Technology. Rafranz Davis (@rafranzdavis) will be presenting.

Rafranz is an instructional technology specialist for a Dallas/Fort Worth area school district. As an advocate for passion-based learning, Rafranz uses her experience as a secondary math educator to help teachers integrate technology using innovative teaching strategies aimed at empowering students to be autonomous learners.


Visit the Global Math Page to reserve your spot!

Video Tutorial Project – A Student Favorite

Lights, camera, action!

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Every now and then I have my students watch an explanation (teaching) video online.  I sometimes do this as a review when I’m beginning a topic that they have studied before.  They always hate it.  They always complain.  So, I rarely assign them teaching videos to watch.  They really hated the last one I assigned.  Their complaining gave me the idea to have THEM make their own teaching videos – and to do it better!

The Video Tutorial Project took a week of class time (and that included watching everyone’s videos one day in class).  However, I did not give them a review day or a test for this unit, so it was only about 3 extra days.  In their written reflections, it was clear that my students LOVED this project.  And, their videos were impressive.  They were creative in their presentations and even added transitions, music, and even special effects.  My favorite video was a take off of Vi Hart’s videos.  There is no way I could have made a video this good, ever!

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I partnered the students into groups of 2, and let them pick their topic from our current unit.  They had to state and define their topic, then show three clearly worked out examples, increasing in level of difficulty with each example.  They could make the video anyway they wanted.  They all had to upload their video to YouTube.

I created a project planning Google document for them to follow, and distributed it using Doctopus.  I had them create the three examples problems for homework one evening and submit them on a GDoc form.  That way, I could check to make sure their examples were sufficient.  In class the next day, they made any necessary corrections and planned their video.  They had the next three days to record and edit their video (if they chose to edit it).  I gave no other homework this week so that students would have time to work at home on it if needed.

Watch all of their Video Tutorials Here

This project was worth the time invested and I will definitely do it again.  The students loved it (see their responses below).  We had a few challenges that I would like to address before assigning this again.  One was finding quiet places to record on campus (it was freezing that week so it was not very comfortable outside).  Another challenge was the partner issue.  Students could only work together at school because this was a partner project.  Also, the video editing (if they use iMovie) always falls on the shoulders of one of the partners, which I don’t like.  I have thought about having each student make their own video tutorial, but they have so much more fun working together.  Also, in their reflections all of my students but TWO would rather work with a partner.  They also would have liked more time, but they always tell me that.  They would work on a project for a month if I let them.  They are awesome.

Student Thoughts:  What did you like the BEST about the project?

  • I felt like it really helped me even because watching the video helped understand the concept better.
  • How we could add our own interesting twist.
  • The part about how you could add in a challenge problem.
  • I loved how you can create a tutorial in so many ways, like white board or like V Hart.
  • working with a partner how creative we got to be
  • it was fun
  • All of it!!!
  • having fun with my friend
  • Recording 😀
  • The fact that we could put what we wanted into the video
  • Getting to use my tablet to draw math.
  • We had alot of freedom to make it however we wanted and everyone had a different video.
  • I thought it was very creative.
  • filming
  • working with partner
  • that we got to make a video
  • Working on whiteboards and working
  • partner work
  • Probably putting it all together
  • That is wasn’t just an ordinary project.
  • The filming part.
  • the creative freedom was fun
  • the filming
  • The recording
  • It was awesome to just be able to go out on our own and make our own tutorial.


Our Code.Org Coding Success – A Summary

Screen Shot 2013-12-17 at 12.43.19 PMLast week my students participated in the Hour of Code.  It was an overwhelming success!  They enjoyed it so much that they continue to code, and they continue to ask me everyday if we are going to code in class.  As soon as they have any extra work time in my class, they are coding!  With these amazing results, I am looking to the future.  I would love to plan lessons and projects with coding involved.  I only hope I have the time to prepare this for my students.  They deserve it.

After our Hour of Code, I surveyed my students to see if they liked coding (on a scale from 1 – 5), and if they would like to continue coding in class.  The results are below.  I have included some excerpts and  you can also read their responses in detail here.  They were emailing me their creations, so I created a “Coding Creations” wiki page where they could add things they have created (or continue to create).

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Quotes from students:

It was really fun to just type in all the stuff and have no clue how it was going to turn out. It was also really fun when I got home and had to figure out what was wrong in all the billion lines of code I had typed in class. After hours of work all I had needed to do was take out the commas in the character’s speech. Thanks to the Hour of Code I am ready to go back and add in more complicated things to my campaign. Computer programming is really fun, and I can’t wait to do some more.

It was interesting and pushed my mind further and gave a sense of power in my mind and keyboard

I love coding so much! I think it is so fun to watch the videos and learn how to code! I woke up at 4:30 two mornings ago to code, and at 5 the day before. I am obsessed.

I thought it was really cool how you type in numbers and words, and it is linked to a little picture. I loved how you could make the holiday cards on khan academy! It was so fun! I also loved how it seemed really hard at first, but after you got the hang of it, and memorized the basic codes, you could create complex pictures.

I think it is really fun to look at all the things we use computer programing for and how important it really is in modern society and then be able to learn to do it! Its AMAZING!

I loved computer programming because you got a head start for the future. This has made me want to do more computer programming in the future!

I did 5 because coding is fun and interactive. It may seem scary but there is a world of computer science out there and coding is one major part.


I also asked them, “What did you like best about coding?”.

I liked best about coding that I could just type some letters and numbers and make what I imagined come to life! It truly is amazing.

It was very cool how you really got to control your computer and that you could build anything you wanted to.

I liked that it really made you think.

What was so cool was that after you got the hang of it you were basically doing it by yourself, at your own speed, and what every you wanted to draw.

It let your creativity flow, you could make anything you wanted with no strict deadlines.

I like coding because it lets you express your self in a more complex way.

The multitudes of possibilities and how simple it really is.

The fact that i could create those things on a computer just by typing in stuff!

The challenge and the good feeling when your character does exactly what you planed for it to do.

Hour of Code = Amazing Success

I cannot say enough good things about the “Hour of Code” that my students participated in today.  When I showed them the intro film yesterday they were so excited about coding they begged for the website link.  I gave them  Another teacher told me that they started working on it immediately in work time yesterday.  Multiple students told me they went home and worked on it last night, some for a couple of hours.

Today, they ran into my room before class even began and asked if they could start.  I was overwhelmed with their excitement and curiosity in coding.  They started with the tutorials but many of my students quickly moved on.  Some of them ended up on Tynker or Code Academy, but the majority landed on Khan Academy and learned to write Javascript on their own.  It was easy for me as all of the websites have video tutorials.  Students were working together and asking each other for help if they had questions or when they got stuck.  At one point, I had half of the classroom around one students computer until he told them to “go and sit down so he could think!”  I took some pictures and videos to share (see below).  If you watch the video clips, be sure to listen to all of the students brainstorming about their programming in the background.  I just noticed that when I watched the video again.  There definitely was a “electric math/computer” buzz from all of my students in the background!  Videos on YouTube!

I signed up on the website but did not receive an email with instructions or a teacher code.  I later saw that I could have the students enter my email address on their page, but by that time they were very involved and I didn’t want to interrupt them to have them put my email in.  Even though I would love to get a summary of what they accomplished it was not worth stopping them.  The whole point of the day was to get all of my students coding.  The mission was accomplished, as I’ve had several students email me the progress they have made tonight with the projects they are still working on!

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I’m not sure how long these tutorials will be available, but I do intend to find a way to give students class time to learn coding in the future.  We have been inspired and I want to give them the opportunity to develop this skill and keep this excitement alive!

Videos on YouTube!