The divisibility rules are quite easy. 2,3,5,9,10
Lets start with 2. the rules for 2 are easy, if a number ends with an even number or a 0 it is divisible by 2.
Now 5, if the number ends in 5 or 0 it is divisible by 5.
A number is divisible by 10 if it ends in 0.
now 3, if you have a number like 2,348, add all the number so. 2+3+4+8=17, you can't divide 17 by 3 so its not divisible by 3, but if you have 3,627 3+6+2+7= 18 so it is divisible by 3.
Now 9, It's exactly the same as 3. all you do is divide by 9.
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