Math, asked by salvee, 1 year ago

what is the divisibility rule of 7

Answers

Answered by sharanya302006

To find out if a number is divisible by seven, take the last digit, double it, and subtract it from the rest of the number. 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.

salvee: 11 divisible rule

salvee: tell me

smriti3008: Take the alternating sum of the digits in the number, read from left to right. If that is divisible by 11, original number will also be divisible by 11

sharanya302006: ok

sharanya302006: The (sum of the odd numbered digits) - (sum of the even numbered digits) is divisible by 11. The number is divisible by both 3 and 4. Delete the last digit from the number, then subtract 9 times the deleted digit from the remaining number. If what is left is divisible by 13, then so is the original number.

Answered by smriti3008

take last digit of a number
multiply it by 2
subtract the answer from remaining number
if you get answer divisible by 7, including zero,
then original number is divisible by 7

sharanya302006: hi

sharanya302006: will u help in my q\a

smriti3008: sure, if I can

sharanya302006: ok

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