In this hands-on activity for 5th – 7th graders, you will be

- designing and making a toy with wheels,
- testing the toy, and
- learning about circles.

Some of the design work can be done on TinkerCad. View this activity digitally or print for offline viewing.

## Math in this activity

- Measurement of length in problem solving
- The parts of a circle, their definitions, and relationships with each other, including
- radius
- diameter
- circumference

- đťś‹ (pi) as the mathematical constant that relates the diameter and circumference of a circle

These circle topics meet 7th-grade standards. Measurement of length can be adapted for different middle-grade levels. For younger students, you can skip the More Math about Circles section which explores đťś‹ (pi).

## For Grown Ups

This packet includes activities for making and math, for you and your kids to do together or for your kids to do on their own. You donâ€™t have to know the math in advance. Be open to exploration, and ask questions such as â€śHow did you do that?â€ť and â€śHow do you know?â€ť

## For Children

Gather the following materials and get ready to make a toy. Along the way youâ€™ll learn a bit of math. If you get stuck on any step, take a breath and try again. It’s okay if you need to restart and use more materials. Good luck and have fun!