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?
Moon Rocks. Different items wrapped in tin foil to become "Moon Rocks" the idea was for the children to understand the biggest item isn't always the heaviest, and the smallest isn't always the lightest. My class were inspired and have been bringing in their own "Moon Rocks" from home and a lot of children are choosing to weigh using fantastic language.