分数乘法（10岁以上）
Multiplying fractions (age 10+)
计算分数或整数乘以分数，包括真分数乘真分数；将 (a/b) × q 理解为把 q 平均分成 b 份后取其中 a 份；答案写成最简形式。
Multiply a fraction or whole number by a fraction, including proper fractions by proper fractions; interpret (a/b) × q as a parts of q partitioned into b equal parts; write answers in simplest form
学习证据 / Evidence
- 计算 (2/3) × (4/5) = 8/15，并用面积模型展示。
- 使用直观模型演示 (2/3) × 4 = 8/3 = 2又2/3。
- 将乘积 3/4 × 2/3 化简为 6/12 = 1/2。
- Compute (2/3) × (4/5) = 8/15 and show with an area model
- Use a visual model to demonstrate (2/3) × 4 = 8/3 = 2 2/3
- Simplify the product 3/4 × 2/3 = 6/12 = 1/2
评估问题 / Assessment
如果一个食谱需要 2/3 袋面粉，而 {{name}} 只想做这个食谱的 3/4，他们能通过将这两个分数相乘算出需要多少面粉吗？
If a recipe uses 2/3 of a bag of flour and {{name}} only wants to make 3/4 of the recipe, can they multiply those fractions to find out how much flour they need?