Question

Find the difference between the smallest $6$ digit number and the greatest $4$ digit number.

Answer 1

Compute the difference:

Smallest $6$ digit number $=100000$

Largest $4$ digit number $=9999$

So the difference is

$$\begin{gathered} =100000-9999 \\ =90001 \end{gathered}$$

Hence, the required difference is $90001$.