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The lowest number you could add to make it divisible by 10, 2, and 5 would be 7.

23 + 7 = 30

30/10 = 3

30/2 = 15

30/5 = 6

Also, technically, you could add (-3) to make 20.

23 + (-3) = 20

20/10 = 2

20/2 = 10

20/5 = 4

Basically, you could add any number to 23 that would get a multiple of 10, since 2 and 5 are both factors of 10 to begin with.

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Q: What could you add to 23 to make is divisible by 10...2..5..?

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