# What is calcudoku?

Question asked by: mrquestion

Asked on: 11 Jan 2010

Calcudoku is the name given to a variation of killer sudoku.

In this variation of the puzzle you also have different types of arithmetic operation to perform other than simply addition.

The other operations are the familiar ones of multiplication, subtraction and division.

Because the multiplication and subtraction are non-commutative operations, that is to say that unlike a + b = b + a the same does not hold for a - b and b - a (just substitute in numbers where a does not equal b to see this), then there are rules about the order of calculations using those operations.

By: knowitall

Replied at: 11 Jan 2010

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