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Everything is a multiple of 7.
The multiples of 7 are 7, 14, 2 1, 28, 35, 42, 49, 56, 63, etc.

There are countless multiples of 7. A multiple of 7 is characterized in that if the single digit of an integer is truncated, the remaining number is subtracted by twice the single digit. If the difference is a multiple of 7, the original number can be divisible by 7.

Multiplier algorithm: the product obtained by multiplying this number by any positive integer is the multiple of this number.

For example, 7× 1=7, and 7 is a multiple of 7, that is, 1 is a multiple of 7.

7×5=35, 35 is a multiple of 7, and 7 is a multiple of 5.

Extended data:

Characteristics of common numerical multiples:

Characteristics of multiples of (1) number 2:

At the end of a number is an even number (0, 2, 4, 6, 8), which is a multiple of 2.

(2) Characteristics of multiples of the number 3:

The sum of the digits of a number is a multiple of 3, and this number is a multiple of 3.

(3) Characteristics of multiples of the number 4:

The last two digits of a number are multiples of 4, and this number is multiples of 4.

(4) Characteristics of multiples of the number 5:

The end of a number is 0 or 5, which is a multiple of 5.

(5) Characteristics of multiples of the number 6:

As long as a number is divisible by 2 and 3, it is divisible by 6.