🔢 Mathematics · Addition & Subtraction
Adding and subtracting (age 7+)
Add and subtract numbers with up to three digits using formal written methods of columnar addition and subtraction
Typical age: 7–8 years
“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?”
0 / 3 mastered
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- Fluent adding and subtracting within 1000REQUIRED
Fluency requires prior experience with columnar methods for three digits
- Adding and subtracting (age 8+)REQUIRED
Four-digit columnar methods extend three-digit columnar methods
- Choosing the right strategy
Choosing mental vs written method exercises strategic tool selection
- Justifying mathematical reasoning
Explaining columnar methods exercises identifying and justifying steps
- Missing number problems (age 7+)
Formal written methods support solving more complex problems