How to know if a number is divisible by 7?
Let us explore the divisibility rule of 7.
Answer: The rule is to double the last digit and subtracts from the remaining number and continue this until only one digit remains. If the end result is 0 or 7, then the original number is divisible by 7.
Let us understand the rule in detail:
Follow the loop:
- Separate the last digit from the number.
- Double the last digit.
- Subtract that from the truncated number thus obtained.
- Continue this process till you are left with only one digit.
- If the single digit at the end is 0 or 7, then the original number is divisible by 7.
For example: 945
94 - 2(5) = 94 - 10 = 84
8 - 2(4) = 8 - 8 = 0
So, 945 is divisible by 7.