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Math crossword puzzles

A square of numbers where every row and every column reads as a true sum. Fill the gaps so all six equations hold at once.

Each grid is checked so the numbers given force exactly one set of answers.

Easy 1

3 numbers to work out.

Math crossword9751610+++−−−======
Show the answersEasy 1, answer key

Easy 2

3 numbers to work out.

Math crossword96310616+−++−+======
Show the answersEasy 2, answer key

Medium 1

5 numbers to work out.

Math crossword212929++++++======
Show the answersMedium 1, answer key

Medium 2

5 numbers to work out.

Medium 2
Show the answersMedium 2, answer key

Hard 1

5 numbers to work out.

Hard 1
Show the answersHard 1, answer key

Hard 2

6 numbers to work out.

Hard 2
Show the answersHard 2, answer key