Mathematics
Addition & Subtraction
Procedural
6–7 yrs
Addition and subtraction strategies
加减法运算策略
Description
Use counting on and counting back as strategies for addition and subtraction
Mastery Evidence
- Add 8 + 3 by starting at 8 and counting on 3 (9, 10, 11)
- Subtract 12 − 3 by counting back 3 from 12 (11, 10, 9)
- Explain that counting on is a way to add
Assessment Prompt
If your child needs to work out '8 + 5', can they start from 8 and count up five more — rather than starting from 1 every time?
Prerequisites 3
Addition as combining or putting together two
以"接着数"作为加法策略需要先理解加法的概念
One More Each Time
向前数/向后数依赖于理解每个相邻数字之间相差1的概念
Subtraction as taking away or separating
以"倒着数"作为减法策略需要先理解减法的概念
Unlocks 0
No follow-up topics
