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Q: Instruction how to get multiples of number 1 to 20?

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The only multiples of 2 are 1 and 2 because it's a prime number, but if you meant first 2 multiples of 20 then it's also 1 and 2.

No number has the multiples of 1, 2, 4, 5, 8, 10, 16, 20, 40, 80, but the number 80 (and all its multiples: 160, 240, 320, 400, ...) has them all as FACTORS.

Since 10 is a factor of 20, all multiples of 20 are multiples of 10. This is also true of 1, 2, 4 and 5.

Multiples result from multiplying a given number by successive counting numbers. 10 x 1 = 10 10 x 2 = 20 10 x 3 = 30 10, 20, and 30 are multiples of 10.

20 is even so all multiples of 20 must be even. 1 is not even.

21

To get a multiple of a number, multiply that number by successive counting numbers. 10 x 1 = 10 10 x 2 = 20 10 x 3 = 30 10, 20, 30 are multiples of 10.

Multiples of what???For example, to get multiples of 20, just start with 20 and add 20 at a time: 20, 40, 60, ...

Multiply the number by successive counting numbers. 10 x 1 = 10 10 x 2 = 20 10 x 3 = 30 10, 20 and 30 are multiples of 10.

Multiply a number by succesive counting numbers. 10 x 1 = 10 10 x 2 = 20 10 x 3 = 30 10, 20 and 30 are multiples of 10.

The numbers are: 1 and 20

Which number is a factor of 20 but not a multiple of 10?

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