整体中的分数
Fractions of a whole
理解分数 1/b 表示把一个整体平均分成 b 份时其中 1 份的数量;理解 a/b 表示 a 个 1/b 份的大小。
Understand a fraction 1/b as the quantity formed by 1 part when a whole is partitioned into b equal parts; understand a/b as a parts of size 1/b
学习证据 / Evidence
- 给出一个平均分成 5 份的图形,能指出其中一份涂色部分表示 1/5
- 能解释 3/4 表示 3 份,每份大小是 1/4
- 能画出模型,表示 2/6 是把一个整体切成 6 份中的 2 份
- Given a shape divided into 5 equal parts, identify one shaded part as 1/5
- Explain that 3/4 means 3 parts each of size 1/4
- Draw a model showing 2/6 as 2 pieces of a whole cut into 6
评估问题 / Assessment
如果把一个披萨切成相等的 6 块,{{name}}能解释 1/6 表示什么,并说出 4/6 的披萨是什么样的吗?
If you cut a pizza into 6 equal slices, can {{name}} explain what 1/6 means — and then work out what 4/6 of the pizza looks like?