MathematicsAddition & SubtractionAges 7–8
Addition and subtraction strategies (age 7+)
Explain why addition and subtraction strategies work, using place value and the properties of operations
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Check understanding
- 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
“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?”
Curriculum record
- Type
- Meta
- Subject
- Mathematics
- Domain
- Addition & Subtraction
- Age range
- Ages 7–8
Standards
ccss-math:2.NBT.9