Mathematics
Addition & Subtraction
Procedural
8–9 yrs
Fluent adding and subtracting within 1000
1000以内加减法流利运算
Description
Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and the relationship between addition and subtraction
Mastery Evidence
- Add two three-digit numbers fluently using an efficient method
- Subtract three-digit numbers fluently, including with regrouping
- Choose the most efficient strategy based on the numbers involved
Assessment Prompt
Can your child add or subtract three-digit numbers like '672 − 348' reliably, choosing whichever method works best for them?
