How to play
- Choose number bonds to 10, 20 or 100.
- Find the missing number.
- Check the answer and complete ten questions.
- Replay weaker number bonds.
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UK primary maths
Number Bonds Builder
Practise number bonds to 10, 20 and 100 with missing-number questions.
Score 0Streak 0Best 0
6 + ? = 10
Find the missing number.
Best score is saved only on this device.
About Number Bonds Builder
Practise number bonds to 10, 20 and 100 in short missing-number rounds.
Tips and strategy
- Use fingers or objects for bonds to 10.
- Look for related facts, such as 3 + 7 and 30 + 70.
- Say both parts and the whole aloud.
Why people play
- Builds addition fluency.
- Supports subtraction and mental calculation.
- Uses short repeatable rounds.
Learn more about Number Bonds Builder
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Which number bonds should children know?
Children usually begin with bonds to 10, then apply the same relationships to 20 and 100.
Is this game free?
Yes. It runs in the browser without an account.
Does it save personal data?
No. Only the best score is saved in the current browser.