🔢 Mathematics · Addition & Subtraction

Fluent addition and subtraction (age 9+)

Fluently add and subtract whole numbers with more than four digits using the standard columnar algorithm

Typical age: 9–10 years

“Can your child accurately add or subtract large numbers — like '23,846 + 14,579' — using the column method, carrying and borrowing correctly however many columns it takes?”

0 / 3 mastered

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Needs first

Adding and subtracting (age 8+)REQUIRED
Columnar add/sub with 4 digits is prerequisite to >4 digits

Unlocks next

Adding and subtracting (age 9+)REQUIRED
Must have fluent written method before applying to multi-step contexts
Addition and subtraction strategies (age 10+)REQUIRED
Decimal addition/subtraction builds on fluent whole-number columnar algorithm