Nine of them.
99 of them.
3 and these are 600,650,and 700
450 whole numbers.
7 two-digit numbers.
Nine of them.
99 of them.
3 and these are 600,650,and 700
600 of them. Any number from 300 tp 899 (inclusive), to the nearest 600.
There are only 999 three digit whole numbers.
450 whole numbers.
There are 900 three-digit whole numbers between 1 and 1000
7 two-digit numbers.
Ten of them.
90000
90
Infinitely many numbers.1 million and 1 whole numbers . Although, technically 34 million, itself, would not be rounded. This would comprise the numbers from [33,500,000, 34,500,000]. In the first case the 5 is rounded up while in the second it is rounded down. This is consistent with the rule of "Round up or down so that the new last digit is even". This is the default rounding mode used in IEEE 754 computing functions and operators.