Mathematics Divisibility Rules
DIVISIBILITY RULES
Divisibility Rules let you test whether one whole number is divisible by another.
It is a quick way to find factors of large numbers.
1. Any number (not a fraction) is divisible by 1.
2. If the last digit is even – 0, 2, 4, 6, or 8.
For example: 1246.
3. If the sum of digits is divisible by 3.
For example – 126, 1 + 2 + 6 = 9/3.
4. If the last 2 digits are divisible by 4.
For example – 512, 12/4.
5. If the last digit is 0 or 5.
For example – 270 or 405.
6. If it is even and is divisible by 3.
The first and second rules are applicable.
For example – 228, 2 + 2 + 8 = 12/3.
7. Divisible by 7, no rule. Divide where applicable.
8. If the last 3 digits are divisible by 8.
For example – 3408 408/8 = 51.
9. If the sum of digits is divisible by 9.
For example – 3258, 3 + 2 + 5 + 8 = 18/9.
10. If the last digit ends in 0.
For example – 100/10.