949
It is 300, rounded to the nearest 200.
When rounding to a whole number, half of the numbers round up, half round down. Thus those with a fractional part 0.5 or greater round up, and those with a fractional part less than 0.5 round down. So the question becomes what is the largest two digit decimal less than 0.5? The smallest 2 digit decimal is 0.01 → 0.5 - 0.01 = 0.49 is the largest 2 digit decimal that can round down. → 3 + 0.49 = 3.49 is the largest 2 digit decimal number that rounds to 3 when rounded to the nearest whole number.
30
Rounded down to the nearest whole number, 30.089 is approximately equal to 30.
As the last digit is a 2, it will round down giving 64 as the answer.
It is 300, rounded to the nearest 200.
When rounding to a whole number, half of the numbers round up, half round down. Thus those with a fractional part 0.5 or greater round up, and those with a fractional part less than 0.5 round down. So the question becomes what is the largest two digit decimal less than 0.5? The smallest 2 digit decimal is 0.01 → 0.5 - 0.01 = 0.49 is the largest 2 digit decimal that can round down. → 3 + 0.49 = 3.49 is the largest 2 digit decimal number that rounds to 3 when rounded to the nearest whole number.
The answer depends on the degree of rounding. To the nearest whole number it is 500.499, To the nearest 10 it is 504.99... To the nearest 100 it is 549.99... Overall, the largest number is 749.99...
30
You would round it down to 140.
4600
To round to the nearest whole number the tenths digit (the one after the decimal point) is the deciding digit whether to round up or down - if it is less than 5 round down, otherwise round up. The tenths digit of 9.13 is 1 which is less than 5 so round down 9.13 → 9 to the nearest whole number.
You can round up to 225 or down to 224.
8000
3.75 rounded to the nearest whole number is 4. When rounding to the nearest whole number, if the decimal is at the .5 mark or higher, round up. If it's less than .5 round down. So 3.5 would round up to 4, but 3.4 would round down to 3.
4 is less than 5, so round down: 10.4 round to 10 to the nearest whole number.
You round down to 0.