if 638521 is to be divisible by 5 , what is the least whole number that should be added to ?
"a number is divisible by 5 if the last digit is either 0 or 5 . here , 638521 = 1 ( last digit is neither 0 or 5 ) . the next multiple of 5 i . e to make the last digit 0 or 5 add 4 4 must be added to 638521 to make it divisible by 5 d"
add(floor(5), const_1)