what is the divisibility rule of 7 and 13.
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Test for divisibility by 13. Add four times the last digit to the remaining leading truncated number. If the result is divisible by 13, then so was the first number. Apply this rule over and over again as necessary.Example: 50661-->5066+4=5070-->507+0=507-->50+28=78 and 78 is 6*13, so 50661 is divisible by 13.
To find out if a number is divisible byseven, 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'sdivisibility, you can apply the ruleagain.Double the last digit and subtract it from the remaining leading truncated number. If the result is divisible by 7, then so was the original number. Apply this rule over and over again as necessary. Example: 826.
Hope this will help you....
To find out if a number is divisible byseven, 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'sdivisibility, you can apply the ruleagain.Double the last digit and subtract it from the remaining leading truncated number. If the result is divisible by 7, then so was the original number. Apply this rule over and over again as necessary. Example: 826.
Hope this will help you....
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