Mathematics Addition & Subtraction Meta 7–8 yrs

Addition and subtraction strategies (age 7+)

加减法策略（7岁以上）

Description

Explain why addition and subtraction strategies work, using place value and the properties of operations

Mastery Evidence

✓ Explain why adding tens and ones separately gives the correct total
✓ Describe why a compensation strategy works (e.g. 'I added 1 too many, so I subtract 1')
✓ Use place-value language to justify a written method step by step

Assessment Prompt

If your child works out '67 + 24' by splitting it into '60 + 20' and '7 + 4', can they explain to you in words *why* that approach gives the right answer?