The question is reprouduced here. Find the largest 5 digit number Which is exactly divisible by 48 largest 5-digit number= 99999 Hint: largest 5-digit number is 9 written 5 times. Similarly largest 1-digit number is 9. Similarly largest 2-digit number is 99 and so on . 99999/48 Quotient= 2083 Remainder= 15 The required number = 99999-15 = 99984 Hint: Remainder is the excess amount in the dividend (99999). Therefore this excess amount is deducted to get the exact dividend divisible by 48.