Addition and subtraction strategies (age 7+)
Mathematics · Addition & Subtraction · meta
Explain why addition and subtraction strategies work, using place value and the properties of operations
What mastery looks like
- 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
Check your understanding
If Addition and subtraction strategies (age 7+) 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?
Prerequisites
Required first