Integer multiplication is a simple operation of addition. The addition of the same addend is equal to the addend multiplied by the number of the same addend. Multiplying the first factor by the number on each bit of the second factor in turn; Multiply by the number on the second factor, and the last digit of the number will be aligned with the second factor; Add up the numbers multiplied by several times.
Multiplication operation properties:
1, the product of several numbers is multiplied by a number, so that any factor in the product can be multiplied by this number and then multiplied by other numbers. For example: (25×3 × 9)×4=25×4×3×9=2700.
2. Multiply the difference between two numbers by a number, so that the minuend and the minuend can be multiplied by this number respectively, and then subtract the product. For example: (137-125) × 8 =137× 8-125× 8 = 96.