Divisibility Tests
Quickly test a whole number against common mental divisibility rules.
Rules used
2: last digit even. 3: digit sum divisible by 3. 4: last two digits divisible by 4. 5: ends 0 or 5. 6: divisible by 2 and 3. 8: last three digits divisible by 8. 9: digit sum divisible by 9. 10: ends 0. 11: alternating digit sum is divisible by 11.