测量比较长度
Comparing lengths by measuring
测量并确定一个物体比另一个物体长多少，用标准长度单位表示长度差。
Measure to determine how much longer one object is than another, expressing the length difference in terms of a standard length unit
学习证据 / Evidence
- 测量两个物体并计算它们的长度差
- 用正确的单位表达长度差（例如“长7厘米”）
- 解决比较问题：“书架比书桌高多少？”
- Measure two objects and calculate the difference in length
- Express the difference using the correct unit (e.g. '7 cm longer')
- Solve a comparison problem: 'How much taller is the bookshelf than the desk?'
评估问题 / Assessment
如果一支铅笔长16厘米，一支蜡笔长9厘米，{{name}}能不能不用把它们并排测量，就算出铅笔比蜡笔长多少？
If a pencil is 16 cm and a crayon is 9 cm, can {{name}} work out how much longer the pencil is — without measuring them side by side?