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# Divisibility Rules

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Knowing the rules of divisibility will help you do mental math more efficiently. This presentation has tricks for 2-13.

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### Divisibility Rules

1. 1. DivisibilityRules!<br />Knowing the rules for divisibility will help you work more efficiently.Check them out!<br />
2. 2. Any number that ends in 2 is divisible by 2!<br />2<br />
3. 3. Add up the digits of the number. If the sum is divisible by 3, then so is the number.<br />3<br />
4. 4. If the last two digits of the number are divisible by 4, then so is the number.<br />4<br />
5. 5. If the number ends in a “5” or “0”, then the number is divisible by 5!<br />5<br />
6. 6. If the number is divisible by 2 and 3, it is also divisible by 6!<br />6<br />
7. 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.<br />7<br />
8. 8. If the last three digits form a number divisible by 8, then so is the number!<br />8<br />
9. 9. If the sum of the digits is divisible by 9, the number is also!<br />9<br />
10. 10. If the number ends in “0”, then the number is divisible by 10.<br />10<br />
11. 11. Alternately add and subtract the digits from left to right. (Think of the first digit as being “added” to 0.) If the result (including 0) is divisible by 11, the number is also.<br />11<br />
12. 12. If the number is divisible by 3 and 4, it is also divisible by 12.<br />12<br />
13. 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.<br />13<br />