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.
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.
Ten of them.
999 of them.
999 of them.
2545 to 2554
Nine of them.
99 of them.
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.
1000 numbers. From 19,500 to 20,499 all round to 20,000
When rounding off, the rule is, "If the first figure to be discarded is 5 or more then the previous figure is increased by 1. Following this rule then 650 is the result of rounding off numbers in the range 645 to 654. As 650 itself is not rounded off then there are 9 whole numbers that can be rounded to 650.
2545 to 2554 -- ten of them.