Cross Numbers works like a crossword, but the answers are numbers and the clues are about maths: ‘a square number’, ‘a multiple of 7’, ‘its digits add up to 15’, or a link to another answer like ‘3 Down × 4’.
Start with clues that allow only a few numbers — two-digit squares or cubes, say — and use the crossings: a digit shared with another answer must suit both clues.
It’s a great way to practise number facts: squares, primes, multiples and place value all come up.
Fill the grid with numbers so every across and down answer fits its maths clue, sharing digits where answers cross.
The full guide, with a worked example and common mistakes: How to play Cross Numbers.
Take the answer to 3 Down, multiply by 4, then subtract 2 — that’s this answer.
A number that reads the same both ways, like 4554 or 121.
Yes — every puzzle here is checked to have exactly one solution.
The solver explains puzzles made here; it can’t read printed clues, but any generated puzzle can be sent to it.