Mathematics
Addition & Subtraction
Procedural
7–8 yrs
Fluent adding and subtracting within 100
100以内加减法流利运算
Description
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and the relationship between addition and subtraction
Mastery Evidence
- Add two-digit numbers within 100 efficiently (e.g. 46 + 37 using place-value partitioning)
- Subtract two-digit numbers within 100 fluently (e.g. 83 − 25)
- Choose between strategies (decomposing, compensating, using known facts) based on the numbers involved
Assessment Prompt
Can your child reliably add or subtract two-digit numbers like '68 + 27' or '91 − 45', choosing the best strategy for each problem?
