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The second question:

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This part of the extended materials mainly examines the knowledge points of multiples:

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, for example, A÷B=C, it can be said that A is C times that of B.

A number has countless multiples, which means that the set of multiples of a number is infinite. Note: you can't call a number a multiple alone, you can only say who is a multiple of who.

1/a multiple of kloc-0/ If the difference between the sum of odd digits and the sum of even digits of an integer is divisible by 1 1, then this number can be divisible by 1 1. Such as 264,3080 and 95949392, 2+4-6= 1 1×0, 3+8-0 =11,9× 4-(5+. The only difference in the process is that the multiple is 1 instead of 2.