货币加法与找零
Adding money and giving change
找出总金额相同的不同硬币组合
Find different combinations of coins that equal the same amount of money
学习证据 / Evidence
- 展示50便士可以用2枚20便士加1枚10便士、5枚10便士或1枚50便士组成
- 系统地找出给定金额的多种硬币组合
- 解释为什么不同的硬币组合总金额相同
- Show that 50p can be made with 2×20p + 1×10p, or 5×10p, or 1×50p
- Systematically find multiple coin combinations for a given total
- Explain why different coin sets give the same total
评估问题 / Assessment
如果{{name}}需要正好凑出30便士，能用不同的硬币组合找出两种或三种方法吗？
If {{name}} needs to make exactly 30p, can they find two or three different ways to do it using different combinations of coins?