Difference of the greatest 7 digit number and the smallest 5 digit number is
A. 9,98,999
B. 99,89,999
C. 99,899
D. 9,98,099

Hint: Let’s first write the greatest 7 digit number and the smallest 5 digit. The difference is simply subtraction of those two numbers.

Complete step by step answer:

So, the greatest 7 digit number is 9999999 and the smallest 5 digit number is 10000,
Now, we have to find out the difference between these two numbers that is
9999999−10000=9989999

So, option “B” is the answer.

Note: For such questions, simple calculation is required. Always kept in mind that what is greatest numbers and what is smallest numbers. In formation of greatest and smallest numbers we know the procedure of arranging the numbers in ascending and descending order. The position of the digit at the extreme left of a number increases its place value. So, the greatest digit should be placed at the extreme left side of the number to enhance its value.