Doubling means multiplying a number by one, which is the same as this number. Double is double, which means a number multiplied by two. For example, twice 2 equals 2 and twice 2 equals 4. But if it is twice, it is not a concept of doubling. For example, 4 is twice as much as 2, which means 4=2+2=2×2. Generally speaking, saying that 4 is twice as much as 2 is a popular and omitted statement.
65438+5 or 0 times of 5, 5 times 2, the number is itself, and the number means "copy". The difference in time can be understood as the difference between one copy and two copies. The multiplication of 5 is 5, and the multiplication of 5 is 10.
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. The quotient obtained by dividing one number by another. For example, a÷b=c, that is, A is a multiple of B.