You express your measurements in liters (convert, if necessary), then use the usual rules for rounding numbers.
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To round off to the nearest liter, you look at the digit immediately to the right of the liter place value. If this digit is 5 or greater, you round the liter value up by 1. If the digit is less than 5, you leave the liter value as it is. For example, if you have 3.6 liters, you would round it to 4 liters, but if you have 2.3 liters, you would keep it as 2 liters.
Oh, dude, it's like super easy. So, to round off to the nearest liter, you just look at the decimal part of the number. If it's 0.5 or higher, you round up. If it's less than 0.5, you round down. Like, no big deal, right?
Well, honey, when you're rounding off to the nearest liter, you just look at the digit right after the decimal point. If it's 5 or higher, you round up. If it's less than 5, you round down. Simple as that, no need to overcomplicate things.
950
549 and 450 rounded off the nearest hundred is 500
372 rounded to the nearest hundred is 400
390
Since 839 is less than 850, round it off to 800.