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Divisibility
Prime Numbers
Greatest Common Factor
Least Common Multiple
DIVISIBILITY
| Number |
Rule of divisibility |
1 |
All whole numbers are divisible by 1. |
2 |
All non-zero numbers with a ones digit of 0, 2, 4, 6, or 8 are divisible by 2. |
3 |
If the sum of a number's digits are divisible by 3, then it is divisible by 3. For example, 222 has digits add to 6, so the whole number is divisible by 3 (222/3= 74). |
4 |
A number is divisible by 4 if its last two digits are divisible by 4. For example, 60,548 is divisible by 4, but 6,250 is not. |
5 |
A non-zero number is divisible by 5 if it ends in 0 or 5. |
6 |
A number is divisible by 6 if it is even (divisible by 2) and also divisible by 3. Any even number divisible by 3 is also divisible by 6. |
9 |
Add the digits. If that sum is divisible by nine, then the original number is as well.
For example, 1,044 (1044/9 =116) is divisible by 9 (because 1 + 0 + 4 + 4 = 9). |
| 10 |
A non-zero number is divisible by 10 if it ends in 0. |
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