Question

This 7-digit number is 8920000 when rounded to the nearest ten thousand.

Answer 1

The ten thousand value in 8920000 is 20000

The values that will round up to 20000 is any value between 15000 (inclusive) and 20000 (not inclusive)
The values that will round down to 20000 is any value between 20000 (inclusive) to 25000 (not inclusive)

For example, 16752 will round up to 20000 to the nearest ten thousand
Another example, 21251 will round down to 20000 to the nearest ten thousand.