The answer may be obtained from the context. If you are talking about the cost of a suit, I would not bother with the nearest cent, but for the cost of a of a small packet of sweets (candy) I would want to know the nearest cent.
To get a specific answer, we'd have to know the size of the tank. Since you used "an", let's assume an 18 gallon tank. 18 x 2.999 = 53.982. Rounded to the nearest cent (hundredth), that's $53.98
78.311
I don't know about 1000,000000000002
8.80
We know that $1.60 is closer to $2 than it is to $1, because it is only forty cents less than $2 while is is sixty cents more than $1. So $2 is the nearest.
I donβt know
2 < 5, so we know that we have to round down for the 10th place:4.7.
It depends in what place you are rounding to. Ex: if you round to the nearest thousand then it is 4500 but if you round to the nearest hundred then it would be 4950. If you round to the nearest ten it would be 4990 and if your round to the nearest one it would be 4999.
0.1%
6900
i dont know so tell me
To round to the nearest whole number, look at the tenths column. If the digit is 4 or less round down; otherwise it is 5 or more and round up. The tenths digit is 9 so round up → 30.92 → 31 to the nearest whole number.