Multiplication is a shortcut to add up the same numbers. The result of its operation is called product, and "X" is the symbol of multiplication. From the philosophical point of view, multiplication is the result of qualitative change caused by additive quantity. The multiplication of integer, rational number and real number is a systematic summary of this basic definition. Multiplication can also be seen as calculating objects arranged in a rectangle, or finding a region of a rectangle with a given side length.

Multiplication refers to how many times a number or quantity has been increased. For example, 4 times 5, that is, 4 increases 5 times, or it can be said that 5 4' s are added together.