Math
KenKen
Kids fill small number grids using arithmetic clues, a bit like Sudoku with sums and products.
KenKen was invented by Japanese math teacher Tetsuya Miyamoto as a way to get his own students thinking. Every grid is split into outlined cages, and each cage shows a target and an operation, such as 6+ or 12×. Kids place numbers so none repeats in a row or column and every cage reaches its target. A 3×3 grid with addition only looks gentle enough for a young child, while 9×9 grids with all four operations are clearly pitched at grown-ups. The official site posts daily puzzles in every size, with notes and hints for anyone who gets stuck, and the puzzle has appeared in The New York Times since 2009. Kids still learning their facts might enjoy the smallest sizes most.
- Ages
- Kids who know their basic math facts, and their grown-ups
- Works on
- Web browser; iPhone and iPad app; Android app
- Topics
- Math
- Languages
- English
- Listed
- 2026-10-18
What kids do
- Fill a 3×3 addition grid
- Use cage clues to place numbers
- Try today’s puzzle in a bigger size
- Make a custom puzzle at a chosen difficulty
Who it suits
Kids who know their basic math facts, and their grown-ups.
Notes for parents
Grids range from 3×3 to 9×9, which lets siblings of different ages each find a fitting size. For classrooms there is a KenKen Classroom program that appears to send out a mixed-level set every Friday.
What you need
- Web browser or phone
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