Integer: Zero-sum natural numbers are called integers. (This only applies to primary schools)

Decimal: first figure out what a decimal is. Fractions whose denominator is 10n (n is a natural number) are called decimals. Because any "decimal" can be written in decimal form, such as 7/ 10 = 0.7, 7/ 10 2 = 0.07, etc. Generally speaking, decimal is a special form of fraction. But you can't say decimals are fractions!

Fraction: refers to dividing a "unit 1" into several parts on average, and the number of one or several parts is called a fraction.

Prime number: a number that has no divisor except 1 and itself.

Complex number: refers to a number with other divisors besides 1 and itself.

Even number: refers to a number divisible by 2.

Odd number: a number that is not divisible by 2.

Factor: the multiplication of two integers, in which both numbers are called product factors, that is, one integer can be divisible by another integer, which is the factor of the former. 2*3=6, then both 2 and 3 are factors of 6.

Multiplication: An integer can be divisible by another integer, which is a multiple of another integer. For example, 15 can be divisible by 3 or 5, so 15 is a multiple of 3 and 5.

True fraction: The fraction with numerator less than denominator is called true fraction. The true score is less than 1, such as 1/2, 3/5, 8/9, etc.

False score: as opposed to true score, it is usually discussed in the positive range. Fractions with numerator greater than or equal to denominator are called false fractions, and the value of false fractions is greater than or equal to 1.

True factor: True factor is usually used for composite numbers. The divisor does not include 1 and the number itself is a true factor. If 6=2*3, then the true factor of 6 is 2 and 3.