Divisibility Math Tricks to Learn the Facts (Divisibility)
Dividing by 2
All even numbers are divisible by 2. E.g., all numbers ending in 0,2,4,6 or 8.
Dividing by 3
Add up all the digits in the number.
Find out what the sum is. If the sum is divisible by 3, so is the number
For example: 12123 (1+2+1+2+3=9) 9 is divisible by 3, therefore 12123 is too!
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December 23, 2008
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