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. "×" is a multiplication sign, the numbers before and after the multiplication sign are called factors, "=" is an equal sign, and the numbers after the equal sign are called products.

For example, 4 times 5, that is, 4 increases 5 times, or it can be said that 5 4' s are added together.

Extended data:

Operating rules:

1, additive commutative law: a+b = b+a.

2. Additive associative law: (a+b)+c=a+(b+c)

3. law of subtraction: a-(b-c) = a-b+c; a-(b+c)=a-b-c

4. Multiplicative commutative law: a× b = b× a.

5. Multiplicative associative law: (a×b)×c=a×(b×c) or a×b×c=a×(b×c).

6. Multiplication distribution law: (a+b)×c=a×c+b×c or (a-b) × c = a× c-b× c.

7. Inverse application of the law of multiplication and distribution: a×c+a×b=(a+b)×c or a× c-b× c = (a-b )× c.

8. Quotient invariance: a ÷ b ÷ c = a ÷ (b× c) = a ÷ c ÷ b; a \b×c = a \b \c