# Fun Middle School Fraction Activity: Fraction Krypto

Have you played the math game, Krypto? This fraction activity is fantastic for problem solving, reasoning, and practicing fraction operations skills. I think your students will love it! Krypto is an activity I learned about at a conference where Dr. Lola May presented (in like 1993, I think!). I didn’t realize until a long time afterwards that it was a commercial game that could be purchased 🙂   I believe it’s also available as an app now.

​I’ve used the game idea from time to time, following the rules as laid out in the book I got at the conference. Krypto can be played with whole numbers or fractions (and with positive and negative integers as well, I’m sure!).

## Playing Krypto With Fractions

The rules are simple (kind of like the “24” game):
1. Choose 5 common fractions, with denominators of halves, thirds, fourths, sixths, eighths, tenths or twelfths.
2. Students add, subtract, multiply, and/or divide the fractions to make the 5 fractions equal the target number of 1.
3. Students receive points for meeting the target number of 1.

• For example, if they reach the target of 1 using only 3 numbers, they get 300 pts
• 4 numbers = 400 pts
• if they use all 5 numbers, they get 1,000 pts.

You can set up the point system any way you’d like.

Krypto can be used as a team effort/team game or individual enrichment activity.

This math activity is a fantastic way to provide practice with all the fraction operations. It promotes problem solving and persistence.

## Fraction Activity Example

When I use this activity, I put fraction cards on the board and leave them for as long as I need (and move them if they get in the way!)

• One solution for this set of fractions in the picture could be 3/4 x 2/3 + 1/2 = 1
• This solution uses only 3 fractions, so that would earn 300 points.​ ​
• Another solution is 2/3 + 2/6 = 1; but that’s only 2 fractions. You might consider giving points for using just 2 fractions, until students get the hang of it.

Can you make the 5 fractions equal 1?

## Krypto With Whole Numbers

If you’d like to try Krypto with whole numbers, the directions are basically the same:
1) Choose 5 numbers (from 1-20)
2)Choose a target number between 30 and 50).
According to the book I received at the conference (yes, I still have it:-), computers at Berkeley, CA showed that a 5-number solution can be found 86% of the time when the 5 numbers and the target number are chosen randomly.

Example:

• Choose 3, 4, 7, 12, 14
• Target number: 42
• Solution (using 4 numbers): (12 – 4) x 7 – 14 = 42

What other solutions can you find?

If you haven’t used Krypto with either fractions or whole numbers, I hope you’ll give it a try.

Interested in more fraction and fraction operation content?
Check out the fraction program, Fractions: From Foundations to Operations.

You can also grab this free fraction operations math wheel (plus other fraction goodies) when you join the email community!

Access the Fraction Wheel

## Ellie

### 7 Ways to Practice Multiplication Facts in Middle School

Welcome to Cognitive Cardio Math! I’m Ellie, a wife, mom, grandma, and dog ‘mom,’ and I’ve spent just about my whole life in school! With nearly 30 years in education, I’ve taught:

• All subject areas in 4th and 5th grades
• Math, ELA, and science in 6th grade (middle school)

I’ve been creating resources for teachers since 2012 and have worked in the elearning industry for about five years as well!