Divisibility Tests

   2: If the number is even then it is divisible by 2.  If a number is even  the ones digit has a 0, 2, 4,6,or 8.

   3: The number is divisible by 3 if the sum of the digits is divisible by 3.

 Example: If you add the digits of 51 which is 5 + 1= 6 and take the sum (6) and divide it by 3. It goes in evenly( remainder of zero) therefore you can divide 51 by 3 and it will go into the number evenly.

   5: If the number ends in 5 or 0 , it is divisible by 5.

   6: If the number is divisible by 2 and 3 then it is divisible by 6.

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

Example: If you wanted to know if you could divide 234 by 9, mentally add 2 + 3+ 4=9.  Therefore 234 can be divided by 9 evenly.

   10:  If a number ends in 0, it is divisible

by 10.