Free game · ages 8–14

Number crossword — a maths crossword for kids

A small grid where every row (across) and every column (down) is a sum. Some numbers are missing — fill the gaps so all six sums are true. Every grid has exactly one answer.

How to play Number Crossword

Choose easy (+ and −, numbers to 9), medium (to 30) or hard (with × grids).
Find a sum with only one missing number and work it out. Then another sum will have one gap left.
Type the numbers and press ✓ Check. If a sum is not true, you see which one.
4 grids a round — complete all 4 for the Crossword Cracker badge.

Skills it builds

✓ Addition, subtraction and multiplication facts
✓ Missing-number problems (inverse operations)
✓ Working step by step

Learn it: Mental Maths MasteryQuick sums in your head make every grid faster. Free lessons, badges and certificates.

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Number Crossword — questions

What is a number crossword?

A maths crossword: instead of words, the rows and columns are number sentences like 4 + 5 = 9. Where a row and a column cross, they share a number.

Does every grid have only one answer?

Yes. The gaps are chosen so that you can always find a sum with just one missing number — so every number can be worked out, one step at a time, and there is only one answer.

How do I find a missing number?

Use the opposite operation: in ? + 5 = 9, take away: 9 − 5 = 4. In 6 × ? = 24, divide: 24 ÷ 6 = 4.

Is it free?

Yes — free in the browser on phones, tablets and computers.

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