7.1 Divisibility

Divisibility Rules:

1. All numbers are divisible by 1
2. If the last digit is even (0,2,4,6,or8) it is divisble by 2
3. If the sum of the digits is divisible by 3, then so is the original number
4. If the last two digits form a number divisible by 4
5. If the last digit is 0 or 5
6. If the number is divisible by 2 and 3
7. Double the last digit and subtract it from the rest of the digits. (Repeat the process
   for larger numbers.) If you get a # that is divisible by 7, then so is the number.
8. If the last three digits form a number divisible by 8
9. If the sum of the digits is divisible by 9
10. If the last digit is 0

Test what you know by applying the divisibility rules for 10 practice numbers at vectorkids.com