Any number between 18.25 and 18.34 will round to the tenths as 18.3. There are an infinite amount of numbers between those two, just keep adding decimal places.
4.4
100
30
One thousand of them - to the nearest thousand, Two thousand of them - to the nearest two thousand, Four thousnad - to the nearest four thousand None - to the nearest whole number.
Any number between 18.25 and 18.34 will round to the tenths as 18.3. There are an infinite amount of numbers between those two, just keep adding decimal places.
4.4
8.21
100
How about 18.25 or 18.29
700
26 and 27
29.999999, 29.999998
30
2.6
One thousand of them - to the nearest thousand, Two thousand of them - to the nearest two thousand, Four thousnad - to the nearest four thousand None - to the nearest whole number.
Infinitely many, since between any two numbers, there are always additional numbers. The exact range of numbers that can be rounded to 3000 depend on how you are rounding - specifically, if you are rounding to the nearest integer, the nearest 10, the nearest 100, or the nearest 1000.