Question

how to identify whether a number is a factor of 4 and 7? please answer as fast as possible..

Answer 1

to check factor of 4 the last 2 digits should be divisible by four
to check by 7 the last digit should be doubled and subract from original

Answer 2

if a number ends with 4 or last two digits number must be divisible by 4 then the number is a factor of 4