两位数加两位数
Adding two two-digit numbers
能利用实物、图示和心算等方法，计算两个两位数的加法和减法。
Add and subtract two two-digit numbers using concrete objects, pictorial representations, and mental methods
学习证据 / Evidence
- 用位值积木或竖式计算出34 + 27
- 用数线或分解法计算出63 − 28
- 说明一种计算两个两位数加法或减法的策略
- Calculate 34 + 27 using base-ten blocks or column addition
- Calculate 63 − 28 using a number line or partitioning
- Explain a strategy for adding or subtracting two two-digit numbers
评估问题 / Assessment
{{name}}能不能借助计数圆片、画图或心算，计算两个两位数的加法或减法，比如'43 + 28'？
Can {{name}} add or subtract two two-digit numbers — like '43 + 28' — using counters, a drawing, or working it out in their head?