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There are two things you have to ask.
1. Does it ends in a zero? If the answer is no then there is no need to move on to the next question. It is not devisible by 20
2. If you take off that zero then are you left with an even number? if the answer to both of these is yes then It is devisible by 20
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How do you know a number is divisible by 6?
the number will also be divisible by 3 and 2
How do you know that a number is divisible by 2?
If a number is even, it's divisible by two.
What number is divisible by 20 and 32?
640.
What number between 20 and 40 is divisible by 2 4 7 and 8?
No number between 20 and 40 is divisible by all 4 numbers. The smallest number divisible by all 4 of those numbers is: 56
If a number is divisible by ten then is it divisible by five?
If a number is divisible by 10 (i.e. 100) then it is also divisible by 5. Ex: 100 by 10, is 10 by 5, is 20 20 by 10 is 2 by 5 is 4 The number of times it is divisible by 5 will always be double the number of times it is divisible by 10, which makes sense because 10 is double 5.
