The answer depends on the extent to which the number is being rounded.
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.3125 as a whole number is zero (0) because it is too small to round up to one.
That depends on how far you round. .5 .49 .487 .4870 I usually go with 4 places, because I am in Statistics, and that is recommended, and it never hurts to have a more exact answer, but it does hurt to round too much.
4539684357321 rounded to the nearest billion is 4540000000000. Look to the digit right of the billions, hundred millions. The hundred millions digit is 9. When rounding anything less than five you round down. When rounding anything five or more you round up. 9 is more than five so you round up to 0, making all the digits to the right 0 too.
Round to the nearest thousandth: 3,000 Round to the nearest hundredth: 2,600 Round to the nearest tenth: 2,580
It depends on where you want to round it to. It could round up to 1. Or 0.71 or 0.701