Vedic / Quicker / Shortcut Math ⇒ Topic : Divisibility of a number by 7

Pranav
 
First of all we recall the osculator for 7. Once again, for your convenience, as 7 x 3 =21 (one more than 2 x 10), our negative osculator is 2. This oscuator '2' is our keydigit. This and only this digit is used to check the divisibility of any number by 7. See how it works :  
 
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