三个一位数相加
Adding Three Small Numbers
运用凑十等策略计算三个一位数的加法
Add three one-digit numbers using strategies including looking for pairs that make 10
学习证据 / Evidence
- 能先算7 + 3 = 10，再算5 + 10 = 15，从而计算5 + 7 + 3。
- 能正确计算任意三个一位数相加。
- 能找出三个加数中有用的数对，使计算更简便。
- Calculate 5 + 7 + 3 by first adding 7 + 3 = 10, then 5 + 10 = 15
- Add any three single-digit numbers correctly
- Identify useful pairs within three addends to make the calculation easier
评估问题 / Assessment
如果{{name}}要计算4 + 6 + 8，他们能先发现4和6凑成10，再加8等于18，而不是按从左到右的顺序依次相加吗？
If {{name}} needs to add 4 + 6 + 8, can they spot that 4 and 6 make 10 first, then add 8 to get 18 — rather than just adding in order from left to right?