This is a fun activity to explore the science of balance and weight in the classroom. Have the students use the classroom balance scales to see how much items from their pencil boxes weigh. Does it weigh 1 bear, 2 bears, 3 bears, or more?

use a hanger to make a balance Math with Legos: How many Legos does it weigh? Now here's a math game that would keep my boys engaged.

Paper bag guessing game- 34 Recyclables to Upcycle for the Kids