Question

what least no. should be added to 42724 to make it divisible by 9​

Answer 1

A no. is divisible by 9 ,if the sum of all its digits is 9 or a multiple of 9.

4+2+7+2+4=19

27 is the next number after 18 which is the multiple of 9.

Now 19+8 =27

So we add 8 to 42724 =42724+8=42732

42732÷9=4748

So ans is 8.

Answer 2

For calculating the least numbers that should be added to the following numbers to make them divisible by 9, we have to divide the given numbers by 9 to get the remainders.

Therefore,

The remainder for 42724÷9 is = 1

The closest previous numbers which are divisible by 9 are

42724-1 = 42723

That is, the next numbers which are divisible by 9 are

42723+9 = 42732

So, the least numbers we have to add are

42732-42724 = 8

Hence, the least number that should be added is 8.