Mathematics
Addition & Subtraction
Procedural
6–7 yrs
Mental addition and subtraction (age 6+)
心算加减法（6岁以上）
Description
Add and subtract a two-digit number and ones mentally and using concrete/pictorial representations
Mastery Evidence
- Calculate 36 + 7 = 43 using objects or mentally
- Calculate 52 − 4 = 48 using a number line or mentally
- Explain bridging through 10 when adding ones to a two-digit number
Assessment Prompt
Can your child work out '36 + 7' or '42 − 5' in their head — keeping the tens in place and only adjusting the ones?
