Mathematics
Addition & Subtraction
Procedural
7–8 yrs
Adding and subtracting (age 7+)
加法与减法（7岁以上）
Description
Add and subtract numbers with up to three digits using formal written methods of columnar addition and subtraction
Mastery Evidence
- Set out a columnar addition correctly with digits aligned by place value
- Carry out columnar subtraction with exchange (borrowing) when needed
- Check the answer using the inverse operation or estimation
Assessment Prompt
Can your child set out a sum like '347 + 265' or '512 − 278' in columns and work through it step by step, carrying or borrowing where needed?
