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Q: What is the smallest number divisible by 20 and 13?

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The smallest number that is divisible by 20 and 15 is 60.

21

20 is.

232792560

No number between 20 and 40 is divisible by all 4 numbers. The smallest number divisible by all 4 of those numbers is: 56

No, both 13 and 100 must be divisible by a common number, since 13 can only be divisible by itself and 1, it is considered a prime number. Ex of using a common number: 20/40 has both 10 and 20 in common, so it can be rewritten as 10/20 or 1/2

No. The smallest number divisible by both 5 and 2 is their lowest common Multiple (LCM) which is 10; ALL multiples of their LCM are divisible by 5 and 2, ie 10, 20, 30, 40, 50, ... are all divisible by 5 and 2.

20

A prime number is a number that is only divisible by itself, and 1. The largest prime number below 20 is 19. The smallest prime number above 60 is 61. So the answer will be 19 + 61 = 80

Yes, if the number is divisible by 20 then it has to be even. Typically if a number is divisible by any number ending in zero (10, 20, 30, etc), the number itself ends in zero as well, which makes it even.

If a number is divisible by both 4 and 5, it's divisible by 20.

Yes.

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