Answer:
= 89,999
Explanation:
The greatest 5-digit number is 99,999, and the smallest 5-digit number is 10,000.
The sum of the greatest and smallest 5-digit numbers is:
99,999 + 10,000 = 109,999
The difference between the greatest and smallest 5-digit numbers is:
99,999 - 10,000 = 89,999
Therefore, the sum of the greatest and smallest 5-digit numbers is 109,999, and the difference between the greatest and smallest 5-digit numbers is 89,999.