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Dividing by 7
- Take the last digit in a number.
- Double and subtract the last digit in your number from the rest of the digits.
- Repeat the process for larger numbers.
- Example: 357 (Double the 7 to get 14. Subtract 14 from 35 to get 21 which is divisible by 7 and we can now say that 357 is divisible by 7.
Dividing by 8
- This one's not as easy, if the last 3 digits are divisible by 8, so is the entire number.
- Example: 6008 - The last 3 digits are divisible by 8, therefore, so is 6008.
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