Use a pan balance to find two collections of objects that have the same mass, eg a collection of blocks and a collection of counters

1. Balancing Act - informal units, combining masses
2. Balancing Act - informal units, balancing 2 cakes
3. Balancing Act - combining masses, informal units
4. Balancing Act - combining masses, informal units
5. A Weighty Issue - equal arm balance, half a kg units
6. A Weighty Issue - equal arm balance, half a kg units
7. A Weighty Issue - equal arm balance, 1kg units
8. A Weighty Issue - equal arm balance, 1kg units