The same as whole numbers. When rounding to a specific place, take a look at the digit immediately to the right of the target. If that digit is 4 or less, zero everything to the right of the target out. If that digit is 5 through 9, increase the target by one and zero everything to the right of it out. If the target is a 9, increasing it will turn it to zero and increase the digit to the left of the target by one.
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Round to the nearest decimal
Add your whole numbers
4.99845805 follows the normal rules of rounding. If it is rounded to 1 decimal place, it becomes 5.0.
the purpose of rounding numbers is that you can get closer to the actual answer
rounding whole numbers and decimals