Counting units: one, ten, one hundred, one thousand, ten thousand, one hundred thousand, one million, ten million and one hundred million are all counting units. The propulsion rate between every two adjacent counting units is 10. This counting method is called decimal counting method.
Numbers: Counting units are arranged in a certain order, and their positions are called numbers.
Divisibility of number: the integer A is divisible by the integer B (b ≠ 0), and the divisible quotient is an integer with no remainder, so we say that A is divisible by B, or that B is divisible by A. ..
If the number A is divisible by the number B (b ≠ 0), then A is called a multiple of B, and B is called a divisor of A (or a factor of A). Multiplication and divisor are interdependent.
Because 35 is divisible by 7, 35 is a multiple of 7, and 7 is a divisor of 35.