Tip of the Day: If the number obtained by subtracting twice the - TopicsExpress



          

Tip of the Day: If the number obtained by subtracting twice the last digit from the number left after removing the last digit, is divisible by 7, then the original number is divisible by 7. For example, consider the number 161. The number left after removing the last digit is 16. If we subtract twice the last digit i.e. 2 from this we get 14. Since 14 is divisible by 7, we can say that 161 is divisible by 7.
Posted on: Sun, 09 Jun 2013 14:50:01 +0000

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