Any number multiplied by another number is the product of two numbers. The multiplication of integers meets the following requirements: commutative law, associative law,? Law of distribution, law of elimination. Multiplication principle: If the dependent variable F is directly proportional to the independent variables x 1, x2, x3, and each independent variable is qualitatively changed, if any independent variable F is missing, it will lose its meaning, which is called multiplication.
Here is the calculation method of multiplying two numbers:
In ancient China, multiplication was carried out by several chips. There are three layers in calculating multiplication: the upper layer is the multiplicand, the middle layer is the product and the lower layer is the multiplier. Multiply the multiplicand by the largest bit of the multiplier, remove the calculation of this bit after multiplication, multiply it by the second bit, and add the numbers on the corresponding bits of the two products until the multiplication is over. For example, 8 1 × 8 1, first put the multiplier and the multiplicand in the high and low places respectively, and multiply 80 by 8 1 to get 6480. When it's used up, it drops.
The level of calculation is to change multiple digits into single digits, multiply multiple digits, multiply one digit and add one digit. The basic principle is exactly the same as the general pen multiplication, except that the order of using multipliers is reversed. In the Middle Ages, several practical and interesting multiplications were popular in India.
Refer to Baidu Encyclopedia-Multiplication for the above information.