Which is greater the greatest whole number with 4 digits or the least whole number with 5 digits?

I'd say any 5-digit number is greater than any 4-digit number.

To determine which is greater between the greatest whole number with 4 digits and the least whole number with 5 digits, we need to find out what these numbers are.

The greatest whole number with 4 digits will have the form 9,999, since it is the largest number that can be created using four digits.

The least whole number with 5 digits will have the form 10,000, as it is the smallest number that can be created using five digits.

Comparing these two numbers, we can see that 10,000 is greater than 9,999. Therefore, the least whole number with 5 digits is greater than the greatest whole number with 4 digits.