The whole class were fantastic at brainstorming how many bottle tops had been collected. After exploring the limitations of counting in 1's, they investigated counting in multiples, making arrays and weighing!
- 1 bottle top weighted 1.38 grams
- It was more accurate to weigh 100 than 10
- Arrays are time consuming, frustrating but good fun. We finally agreed that we had 29 x 63 bottle tops (from memory)