运算性质

运用运算性质（交换律、结合律、分配律）作为乘法和除法的计算策略

Apply properties of operations (commutative, associative, distributive) as strategies to multiply and divide

学习证据 / Evidence

• 运用交换律：如果6 × 4 = 24，那么4 × 6 = 24
• 运用分配律：8 × 7 = 8 × 5 + 8 × 2 = 40 + 16 = 56
• 运用结合律计算三个数相乘：2 × 3 × 5 = 6 × 5 = 30

• Use commutativity: if 6 × 4 = 24 then 4 × 6 = 24
• Use the distributive property: 8 × 7 = 8 × 5 + 8 × 2 = 40 + 16 = 56
• Use associativity to multiply three numbers: 2 × 3 × 5 = 6 × 5 = 30

评估问题 / Assessment

{{name}}能不能用拆分数字这类技巧，比如把“6 × 14”算成“6 × 10 + 6 × 4 = 60 + 24 = 84”，来让乘法变得更简单？

Can {{name}} use tricks like breaking up a number — working out '6 × 14' as '6 × 10 + 6 × 4 = 60 + 24 = 84' — to make multiplication easier?