Divisibilty Rules for Division by 8
Here's how to tell if a given number is divisible by 8:
This one is a little tougher... Check the last three digits. If they are divisible by 8, then the entire number is divisible by 8.
Of course, this begs the question, how do you know if the last three numbers are divisible by 8. To check that, use the following rules:
If the first of the three digits are even, the number will be divisible by 8 if the last two digits are divisible by 8.
If the first of the three digits is odd, subtract 4 from the last two digits. If this result is divisible by 8, then the number is divisible by 8.
As an example, consider 5928. The last three digits are 928. Since the first of these is odd, we subtract 4 from 28 to get 24. Since 24 is divisible by 8, the number 5928 is then divisible by 8.
This one is a little tougher... Check the last three digits. If they are divisible by 8, then the entire number is divisible by 8.
Of course, this begs the question, how do you know if the last three numbers are divisible by 8. To check that, use the following rules:
If the first of the three digits are even, the number will be divisible by 8 if the last two digits are divisible by 8.
If the first of the three digits is odd, subtract 4 from the last two digits. If this result is divisible by 8, then the number is divisible by 8.
As an example, consider 5928. The last three digits are 928. Since the first of these is odd, we subtract 4 from 28 to get 24. Since 24 is divisible by 8, the number 5928 is then divisible by 8.
| Rating: | 0% positive, 1 Vote |
| Categories: | math division numbers |
| Added: | on Mar 27, 2007 at 8:26 am |
| Added By: | connerj |
