## “Jumping Calculator” Build Muscles & Brain Cells in Math Class

To know math facts with automaticity and accuracy, students must be able to recall an answer without thinking twice. In fact, a true recall is a smooth as looking at someone’s face and knowing their name immediately. It takes practice and without that, you see kids counting up, guessing wrong and fatefully stalling out in math.

I created a multiplication fact memorization rewards program out of necessity and a need for parent buy in. I rolled my 1980’s jazzercise trampoline into the classroom and told the kids that they needed to memorize their multiples of 3 through 12. I explained that they wouldn’t “pass” unless they could say their multiples aloud in between each jump on the trampoline they were marveling at. Students immediately bought into the idea, but thought it was going to be too easy.

I decided to tie in a rewards program similar to most martial arts systems, where you “test” for a belt. A parent of one student owns a JuJutsu Academy and bought me 16 feet of every color belt they use at their academy. Next, a sweet grandparent volunteered to cut, sew and grommet each student a keychain-size belt that they can earn by jumping their multiples. The endless hours of sewing and promoting this program were worth it when the students were given their first testing day in math class last week.

To put anxieties aside, I let students “try” the tramp while jumping to their multiples of 2. They got the feel for speaking while jumping, timing each multiple as their feet hit the ground, and some humility. I set the groundrules for the program:

- No laughing. (unless someone falls off a 4-foot diameter trampoline)
- Hold all applause to the end. (passive agressive way to tell them to clap.)
- You can “try out” during math class or after school. (if you prefer a smaller audience)
- You have to say each multiple (through 12) before your feet hit the tramp.
- No gloating.
- Keep your keychain of belts in a safe place. (not easily replaced)
- Practice on the ground. That’s easier than the tramp.
- Milk your parents for all sorts of gratitude once you get your black belt!

The first “try outs” were a huge success. Some stumbled, but their confidence did not. The room was buzzing with studens practicing for their white belts (3’s). Next, they cheered eachother on as they earned their belt and set goals for the next one. Some were promising a black belt by Thanksgiving. Others were talking about whether their jumbo trampoline at home would be an advantage or disadvantage. Only one week in and the buy-in is huge.

So, the obvious question is…How will memorizing multiples help students learn their multiplication facts? First, students will look at a multiplication problem and automatically narrow their answer choices down to the 12 numbers called out while jumping. They will slowly narrow product choices to those within a reasonable range. When a student is asked 6×8 and they incorrectly answer 68, you can simply remind the student that 68 was NEVER a multiple they called out during their whole trampoline experience. Ruling out impossible answers helps students to grasp the reality of how many facts they really need to memorize.

Keep an inventory of which facts your student knows. Use many informal routes for quizzing throughout the day. If they are stumped, have them jump the multiples. See if that helps. It should. But if not, consider this: Their hearts are healthier, confidence is up and they have trained their brain to think quickly.