# Puzzles

Try these puzzles yourself or with your students!

Fraction Stretch!

Fraction Stretch is an interactive fraction puzzle that has deep connections to other mathematical ideas. The premise? Two fraction bars are *mislabeled. *Your job is to stretch and shrink them until they are correctly labeled. Ideal for 5th or 6th grade, but can be used with all of K-12. It’s that rich!

Rubber Band Perimeter

In this interactive puzzle, try to stretch a digital rubber band to make a perimeter of 24. Can you find a way to do it with 7 vertices?

Three Rotations

This is an open-ended puzzle that asks you to find rotations that pass through a given point 3 times. Bonus points for creativity!

Rubber Band Area

In this puzzle a rotating arm stretches the sides of a square. Your job? Try to write a function that outputs the area as the arm revolves!

Ripple Functions

Quite possibly the most satisfying function modeling task in the world. Design functions that guide a circle over emanating ripples.