🔢 Mathematics · Addition & Subtraction

Number bonds

Recall number bonds (addition and related subtraction facts) within 20

Typical age: 5–6 years

“Can your child quickly recall facts like '8 + 7 = 15' and immediately know that '15 − 7 = 8' — without having to work out the subtraction from scratch?”

0 / 3 mastered

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Needs first

Number bonds to 9REQUIRED
Number bonds within 20 builds on knowing bonds to 10
Fluent adding and subtracting within 5REQUIRED
Recalling bonds within 20 builds on fluency within 5

Unlocks next

Place value understanding and number facts
Using number facts to solve problems benefits from known addition/subtraction facts
Adding and subtractingREQUIRED
Adding/subtracting to 20 procedurally requires knowing the number bonds