数的加法
Adding numbers
运用位值和运算性质的策略，将最多四个两位数相加。
Add up to four two-digit numbers using strategies based on place value and properties of operations
学习证据 / Evidence
- 把三个或四个两位数按十位和个位分组相加
- 寻找能凑成10的倍数的数对，以简化加法
- 解释合并多个加数时所用的策略
- Add three or four two-digit numbers by grouping tens and ones
- Look for pairs that make multiples of 10 to simplify addition
- Explain the strategy used to combine multiple addends
评估问题 / Assessment
{{name}}能否通过巧妙分组来相加四个两位数——比如“14 + 23 + 32 + 19”——而不是机械地从左到右依次计算？
Can {{name}} add up four two-digit numbers — like '14 + 23 + 32 + 19' — by grouping them cleverly, rather than just plodding through from left to right?