Forty students in physical education class stood in a row facing the teacher and counted from left to right according to the teacher's password. Then the teacher gave up.

Forty students in physical education class stood in a row facing the teacher and counted off from left to right according to the teacher's password.

Multiples of 4: 4,8, 12,16,20,24,28,32,36,40.

Multiples of 5: 5, 10, 15, 20, 25, 30, 35, 40.

Multiples of 6: 6, 12, 18, 24, 30, 36.

So there is still 40- 19=2 1 (person)

"Times" is actually the quotient of two numbers (this quotient can be in the form of integer, decimal, fraction, etc.). "Multiplication" refers to the relationship between numbers, which is based on the concept of divisibility. For example, 42 is divisible by 7, and 42 is a multiple of 7. It can be seen that "multiple" cannot exist independently, and the form of logarithm has special requirements (it must be an integer).

The difference between multiples and multiples

If the number of some objects is 1, and some are so few, then the number of other objects is several times that of these objects. As the name implies, multiple refers to the relationship between quantity and quantity, which is based on the concept of multiplication and division.

Take the following as an example:

One class 15 boys and 30 girls.

Because 15×2=30, or 30÷ 15=2, we say that the number of girls (30) is twice that of boys (15).

In other words, the number of boys is twice that of 15, and finally it is equal to the number of girls, which is 30.