100
All numbers can be rounded to the nearest ten.
There are infinitely many such numbers.
999 of them.
70
0
All numbers can be rounded to the nearest ten.
An infinite number.
88500
530
There are infinitely many such numbers.
1000
The numbers 250-259 can be rounded to 300. Also 301-349 can be rounded down to 300. This works if you are rounding by the nearest hundreds place.
999 of them.
70
Well, isn't that a happy little question! When you round numbers to the nearest 500, you can round any number to the nearest 500. That means there are infinite numbers that can be rounded to 500. Just remember, there are no mistakes in rounding, only happy little accidents!
70
33,500,000 to 34,499,999