乘法交换律
Commutative Multiplication
理解并运用乘法交换律，知道除法不具有交换性。
Understand and apply the commutative property of multiplication and recognise that division is not commutative
学习证据 / Evidence
- 解释 3 × 5 = 5 × 3，并用旋转的点阵图来展示。
- 利用交换律选择更容易的计算。
- 说明 12 ÷ 3 ≠ 3 ÷ 12。
- Explain that 3 × 5 = 5 × 3 and show this with an array rotated
- Use commutativity to choose the easier calculation
- Demonstrate that 12 ÷ 3 ≠ 3 ÷ 12
评估问题 / Assessment
{{name}}是否知道 4 × 7 和 7 × 4 的答案一样，所以可以选择乘法口诀表中更容易记的那个顺序来算？
Does {{name}} know that 4 × 7 gives the same answer as 7 × 4 — so they can choose whichever order is easier to remember from their times tables?