Question

___ is to be added to 4 digit greatest number to get 5 digit least number

Answer 1

Greatest 4 digit number - 9999

Least 5 digit number - 10000

Number should be added to greatest 4 digit number to make it least 5 digit number = 10000 - 9999

= 1 ( Ans )

Answer 2

Without additional conditions (such as using distinct digits), I say that the largest four-digit number is 9999 and we need add only one (1) to get the smallest five-digit number. 10,000.