Mathematics
Show that the number 6486 is not divisible by 7.
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Answer
According to the divisibility of 7, take the last digit of the number, double it then subtract the result from the rest of the number, if the resulting number is divisible by 7 then the number is divisible by 7.
The number is 6486.
The last digit is 6 and its double is 12.
Rest of the number = 648
Subtract 12 from 648 to get 648 - 12 = 636.
Take 636 as the number.
The last digit is 6 and its double is 12.
Rest of the number = 63
Subtract 12 from 63 to get 63 - 12 = 51.
51 is not divisible by 7.
Hence, 6486 is not divisible by 7.
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