除以分数
Dividing by Fractions
理解并计算整数除以单位分数（如 4 ÷ 1/5 = 20）；使用直观模型以及乘除法之间的关系，解释为什么商比被除数大。
Interpret and compute division of a whole number by a unit fraction (e.g. 4 ÷ 1/5 = 20); use visual models and the relationship between multiplication and division to explain why the quotient is larger than the dividend
学习证据 / Evidence
- 计算 4 ÷（1/5）= 20，并解释：“4个整体里有多少个五分之一？”
- 为 6 ÷（1/4）编一个故事情境，并解决它。
- 通过展示 20 ×（1/5）= 4，来验证 4 ÷（1/5）= 20。
- Compute 4 ÷ (1/5) = 20 and explain: 'How many fifths fit in 4 wholes?'
- Create a story context for 6 ÷ (1/4) and solve it
- Verify 4 ÷ (1/5) = 20 by showing 20 × (1/5) = 4
评估问题 / Assessment
如果你有4米丝带，每个蝴蝶结需要1/5米，{{name}}能算出可以做多少个蝴蝶结吗？并解释为什么答案比4大？
If you have 4 metres of ribbon and each bow needs 1/5 of a metre, can {{name}} work out how many bows you can make — and explain why the answer is bigger than 4?