First of all, a brief introduction.

When writing vertical marks, write vertical marks first; Then write the dividend and divisor on the inside and left of the divisor respectively; Quotient is written on the divisor and aligned with the unit of the dividend; Then write the product of quotient and divisor under the dividend (aligned with the same number).

Second, division.

1 and division are one of the four operations. Given the product of two factors and a non-zero factor, the operation of finding another factor is called division. Division of two numbers is also called the ratio of two numbers. If ab=c(b≠0), the operation of finding another factor A by multiplying the product C and the factor B is division, which is marked as c÷b and pronounced as C divided by B (or B divided by C).

2. Among them, C is called dividend, B is called divisor, and the result of operation A is called quotient; Dividend = quotient; Dividend quotient = divisor; Quotient x divisor = dividend; There is a remainder: dividend-divisor = quotient ... remainder (where the remainder is less than the divisor); Divider × quotient+remainder = dividend.

3. Operation property: the dividend is enlarged (reduced) by n times, and the quotient is correspondingly enlarged (reduced) by n times when the divisor is unchanged; The divisor is expanded (reduced) by n times, while the dividend is unchanged, and the quotient is correspondingly reduced (expanded) by n times; The nature of division: continuous division by two divisors is equal to division by the product of these two divisors. Sometimes simple operations can be performed according to the nature of the division.

Third, vertical type.

Vertical type means that each transition number is changed by the last transition number, and then the single digits of the last transition number are multiplied by 2. If carry is needed, proceed to 1, then increase the unit number by ten digits, and so on, and add a new operand to the unit number. Longitudinal formula refers to a longitudinal formula in the calculation process, which makes the calculation simple.

Fourth, mathematics.

Mathematics [English: Mathematics, from ancient Greece μ? θξμα(máthēma)； Often abbreviated as math or maths], it is a discipline that studies concepts such as quantity, structure, change, space and information. Mathematics is a general means for human beings to strictly describe and deduce abstract structures and patterns of things, and can be applied to any problems in the real world.