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

The smallest 6-digit number is 100000 and the greatest 4-digit number is 9999.

Answer: The difference between the smallest 6-digit number and the greatest 4-digit number is 90,001.

Let's find the difference between the smallest 6-digit number and the greatest 4-digit number.

Explanation:

The smallest 6-digit number is 1,00,000.

The greatest 4-digit number is 9,999.

The difference between these numbers would be =1,00,000 - 9,999 = 90,001.

Thus, the difference between the smallest 6-digit number and the greatest 4-digit number is 90,001.