505.
Although many schools teach you to round 5 up, always rounding up from 5 is inappropriate because it introduces an upward bias. The IEEE (Institute of Electronic and Electrical Engineers) standard 754 is to round 5 up or down so that the new last digit is even. See link for more: //en.wikipedia.org/wiki/Rounding#Round_half_to_even
504
94 is the greatest two-digit whole number that when rounded to the nearest ten rounds to a two-digit number.
500.0
500
7200
199
94 is the greatest two-digit whole number that when rounded to the nearest ten rounds to a two-digit number.
54
530
500
34,499,999
364
4900 and 4940
350
That number is 33,999,999.
500.0
It is 549 rounded to the nearest 100 is 500
340