Calcudoku Games Online Free
Calcudoku mixes Sudoku with arithmetic. Put each number once in every row and column, and make every cage hit its target. Start with 3 × 3 addition, add subtraction at 4 × 4, then use all four operations at 5 × 5 and 6 × 6. Every puzzle has one solution and can be solved without guessing.
5 games
How Calcudoku works
Calcudoku is a math logic puzzle, also known as KenKen-style or MathDoku. On an n × n grid, each row and each column contains the numbers 1 to n exactly once, like Sudoku. The grid is also divided into outlined cages, and the numbers in each cage must make the cage’s target using its operation: +, −, × or ÷.
Start with 3 × 3 Calcudoku for kids, which uses only addition. 4 × 4 Calcudoku adds subtraction, and 5 × 5 and 6 × 6 Calcudoku use all four operations. The Daily Calcudoku is a new puzzle every day.
Every cage is a number fact in reverse, so Calcudoku is good practice for times tables and division facts as well as logic.
Questions and answers
What is Calcudoku?
A number puzzle where each row and column uses the numbers 1 to n exactly once, and outlined groups of squares (cages) must combine to a target using +, −, × or ÷. The same kind of puzzle is sold as KenKen® (a trademark of Nextoy, LLC) and is also called MathDoku.
Is Calcudoku good for learning math?
Yes. Every clue is an arithmetic question in reverse: “which two numbers multiply to 12?” Children practise number facts, factors and checking their work while solving a logic puzzle.
Which size should I start with?
Start with 3 × 3 Calcudoku for kids if you’re new, or 4 × 4 if you’re happy with addition and subtraction. 5 × 5 adds multiplication and division, and 6 × 6 is the biggest challenge.