3 499
999 of them.
Nine of them.
99 of them.
Ten whole numbers can be rounded to 30. The numbers are 25, 26, 27, 28, 29, 30, 31, 32, 33 and 34. There are an infinite number of complex numbers in the interval [25,35) that can be rounded to 30.
3 499
Ten of them.
999 of them.
999 of them.
2545 to 2554
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.
Nine of them.
99 of them.
3000 ÷ 20 = 150Note: as there is nothing after the decimal place, 3000 and 20 are treated as whole numbers, and not decimals.
6500 to 7499 -- 1000 numbers
0
Ten whole numbers can be rounded to 30. The numbers are 25, 26, 27, 28, 29, 30, 31, 32, 33 and 34. There are an infinite number of complex numbers in the interval [25,35) that can be rounded to 30.