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Q:
How can you tell whether a number is divisible by another number (leaving no remainder) without actually doing the division?
A:

A Number is Divisibility by:


2 : If the last digit is even, the number is divisible by 2.


3 : If the sum of the digits is divisible by 3, the number is also.


4 : If the last two digits form a number divisible by 4, the number is also.


5 : If the last digit is a 5 or a 0, the number is divisible by 5.


6 : If the number is divisible by both 3 and 2, it is also divisible by 6.


7 : Take the last digit, double it, and subtract it from the rest of the number; if the answer is divisible by 7 (including 0), then the number is also.


8 : If the last three digits form a number divisible by 8, then so is the whole number.


9 : If the sum of the digits is divisible by 9, the number is also.


10 : If the number ends in 0, it is divisible by 10.


11 : Alternately add and subtract the digits from left to right. If the result (including 0) is divisible by 11, the number is also. Example: to see whether 365167484 is divisible by 11, start by subtracting: 3-6+5-1+6-7+4-8+4 = 0; therefore 365167484 is divisible by 11.


12 : If the number is divisible by both 3 and 4, it is also divisible by 12.


13 : Delete the last digit from the number, then subtract 9 times the deleted digit from the remaining number. If what is left is divisible by 13, then so is the original number.

In: Math
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