Mathematics
Addition & Subtraction
Procedural
8–9 yrs
Adding and subtracting (age 8+)
加法与减法（8岁以上）
Description
Add and subtract numbers with up to four digits using formal written methods of columnar addition and subtraction
Mastery Evidence
- Set out and solve a columnar addition with up to four-digit numbers
- Set out and solve a columnar subtraction with exchange across multiple columns
- Check the answer using estimation or inverse operations
Assessment Prompt
Can your child line up a sum like '3,842 + 1,765' or '4,301 − 2,658' in columns and work through it correctly — carrying and borrowing across multiple columns?
