According to the meaning of the formula, dividend, prime number (divisor)-divisor-horizontal line (equal)-quotient-product-remainder are consistent with the vertical form of addition, subtraction, multiplication and division, which is easy to understand.

Taking 72 divided by 6 as an example, the vertical form is as follows:

Write the dividend first, then write a horizontal line above the dividend, then write an apostrophe at the left end of the horizontal line, and finally write the divisor at the left end of the apostrophe! The remainder to be divided must be less than the divisor, and the bit dividend is placed in the right bit of the remainder.

Law of division:

The purpose of division is to find the quotient, but when you suddenly can't see how many quotients are contained in the dividend, you can use the method of trial quotient and estimated quotient to see how many divisors are contained in the highest digit of the multiplicand (that is, how many times the quotient is contained), and then add several times the complement from the standard number to get the quotient.

Small array: When the dividend contains divisor 1, 2 or 3 times, the method is as follows:

Dividend includes quotient 1 multiple: the complement is added once from the standard.

Dividends include two quotients: from standard to supplementary.

Dividends include three quotients: from standard to supplementary three times.