Rounding a number is done by adding or subtracting to get an even or more manageable number. You can round to any number you wish, common picks are rounding to then nearest 5, 10, 20, or 100. In your case 6442 if rounded in order of my suggestions would become this: 6440, 6440, 6440, 6400. The nearest thousand would be 6000. If your number currently stands less then half you round down, more than half round up, ties always round down.
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You take the number before the number you want to round it to. Round to tens: 97112770 (7 is greater then 4, so you round up) round to hundreds: 97112800 (6 is greater then 4 so you round up) round to thousands:97113000 (greater then 4, round up) round to ten thousands: 97113000 (greater then 4, round up) round to hundred thousands: 97100000 (less then 4, round down) round to millions: 97000000 (less then 4 round down) round to billions: 10,000,000 (more then 4 round up)
To round to the nearest whole number, round down to 60. To round to the nearest hundred, round up to 100.
round up
Round off to the nearest cent, means round off to the nearest hundredths or round off to two decimal.
Anything 5 or about round it up. 4 or below round down. Example: 4.2 round down to 4.0 6.7 round up to 7.0 4.76 round up to 4.8