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A number is divisible by 3 if the sum of the digits ends is divisible by 3
A number is divisible by 4 if the last two digits are divisible by 4
A number is divisible by 5 if it ends with a 0 or 5
A number is divisible by 6 if it is divisible by both 2 and 3
Divisible by 7: we multiply each respective digit by 1,3,2,6,4,5 working backwards and repeat as necessary
A number is divisible by 8 if the last three digits are divisible by 8
A number is divisible by 9 if the sum of its digits is divisible by 9
A number is divisible by 10 if it ends with a 0
A number is divisible by 11 if the sum of the odd digits - the sum of the even digits = 0 or is a multiple of 11
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