Test of divisibility by 7
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double the last digit of the number
substract the product from leading truncated number
if result is divisible by 7,then the given number is divisible by 7
eg: 826
double 6
6*2=12
then 82-12=70
70 is divisible by 7
therefore 826 is divisible by 7
substract the product from leading truncated number
if result is divisible by 7,then the given number is divisible by 7
eg: 826
double 6
6*2=12
then 82-12=70
70 is divisible by 7
therefore 826 is divisible by 7
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