«Let me explain this rule by taking examples»
If you had 343, you would double the last digit to get six, and subtract that from 34 to get 28.
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If you get an answer divisible by 7 (including zero), then the original number is divisible by
seven. If you don't know the new number's divisibility, you can apply the rule again EXAMPLE.
Example -:
623: 62 - (3 × 2) = 56 = 7 × 8
483: 48 − (3 × 2) = 42 = 7 × 6
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