1 - Getting Started ~3 mins
The class pencil case feels heavy… but how heavy? "Very" is not a number. Could cubes give us one?
2 - Watch and Notice ~8 mins
Three objects on the balance, one at a time. Cubes sit on the other pan so the beam is level. The cube count is the weight written as a number.
Look at the three cube counts side by side. Put them in order from lightest to heaviest.
3 - Try It Together ~9 mins
Put the object on one pan. Add cubes one at a time to the other pan until the beam sits level. Count the cubes aloud — that number is the weight.
Add cubes until the pans sit level
4 - Write the Rubber's Weight ~2 mins
In your maths copy, write: the rubber weighs ___ cubes.
5 - Class Challenge ~14 mins
Balance each object with cubes. Then use only the cube counts to compare.
- crayon
- glue stick
- stapler
- Last one, with no balance: the scissors balanced 12 cubes and the stapler balanced 15. Which is heavier?
Weigh and compare with cubes
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