In order to round a number to the nearest cent, we need to round the value to the nearest hundredth. Here is the example that might help you:
102.235
3 is in the hundredth place.
5 is in the thousandth place, which is adjacent to the hundredth place.
Since 5 is at least 5 (5 or greater), round up the value to obtain 102.24.
If the number in the thousandth place is less than 5, then round down the value. For instance, if the number is 102.234, then the rounded value is 102.23
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Round off to the nearest cent, means round off to the nearest hundredths or round off to two decimal.
Round off to the nearest cent means round off to the nearest hundredths or round off to two decimal places. SO when you round 117.057 you want to look at .057. Since 7 is the greater than 5, we would round the 5 to a 6. Which would make the number 117.06
what is 2.857 to the nearest cent
You have asked to round the number to the nearest cent, but you have not said what the units are which that number represents. If it is 386.75 cents, then if we round it to the nearest cent, we get 387 cents. If, however, it is $386.75 then you can't round it to the nearest cent, you could only round it to the nearest dollar (in which case the answer would be $387).
When talking about money one cent is two decimal places. $0.01 (one cent) one tenth of a cent is to three decimal places $0.001 (one tenth of a cent) So if you are rounding to the nearest tenth of a cent round to the third decimal place. Round up if the fourth decimal place is 5 or higher and round down if it is 4 or lower.