# Unders and Overs

Here’s where I got the idea for “Unders and Overs.”

Yesterday my colleague alerted me that we were behind in our 6th grade pacing calendar by almost two chapters. I’m always behind in this annoying and demanding calendar but never quite this far back. So just like that I told the kids we were done with Chapter 8 and let’s move on to Chapter 9 — Probability!

What’s the best way to start a new unit? We play a game, of course.

I ask the kids to take out a blank sheet of notebook paper, place it on their desk in landscape layout, divide the paper into thirds, and mark the each section like this:

I give each kid a bag of centimeter cubes. (We use these often for all sorts of things.)  I tell them to take out only FIVE cubes — and this is their money. The remaining cubes in the bag represent the dealer’s money. I am the dealer. I tell them to be honest — because it sucks to cheat — and they may not borrow and will have to sit out if they lose their 5 cubes.

I explain the game: I will roll two dice, if the sum is under or over 7, then I — the dealer — pay them even money, and if the sum is equal to 7, then I pay them 3 to 1. I do a few examples to make sure they understand. I trust them to reach into the bag to take out the dealer’s money if they win and to put money into the bag if the lose. They lose when they place a bet on a space that I did not roll.

I check across the room to make sure they place their bets prior to seeing the dice roll. These are 6th graders — they are adorable but I wouldn’t put it past them to fib on bets!

First roll: we get a 2 and a 5, so the sum is 7… the kids cheered! The second roll was under 7, they roared! The third roll was over 7, they went nuts!

They are having so much fun! I pause to remind them to think about the math. What math? And that’s okay right now. The ones who are winning are betting more cubes. Leo puts one cube on each of the three spaces, Arthur tells him, “I don’t think that’s a good idea.”  Melanie is betting on all three spaces anyway, she says this will give her a better chance of winning.

The math will turn up eventually. Let’s just have fun right now.

• ### Get Posts by Email

• Visual Patterns
• Math Talks
• 180 Days of Math at Mesa
• Between 2 Numbers
• Math Arguments 180
• Estimation 180
• Dan Meyer's 3-Act Math Tasks
• Robert Kaplinsky Lessons
• Nathan Kraft's Virtual Filing Cabinet
• Sam Shah's Virtual Filing Cabinet
• Mathalicious Lessons
• Math Munch
• Yummy Math Lessons
• Desmos Classroom Activities
• Graphing Stories
• Math Mistakes
• 101 Questions
• Would You Rather
• Open Middle
• Which One Doesn't Belong?
• Fractions Talk