Mathematics
Addition & Subtraction
Procedural
6–7 yrs
Addition and subtraction within 20
20以内的加减法
Description
Add and subtract within 20 using strategies such as making ten, decomposing a number leading to ten, and using known facts
Mastery Evidence
- Solve 8 + 6 using making ten: 8 + 2 + 4 = 14
- Solve 13 − 4 by decomposing: 13 − 3 − 1 = 9
- Use a known fact (8 + 4 = 12) to derive 12 − 8 = 4
Assessment Prompt
If your child needs to work out '8 + 6', can they split the 6 into 2 + 4, use the 2 to fill up to 10, then add the remaining 4 to get 14?
