What ismean by rounding number

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Wiggin42 | Student, Undergraduate | (Level 2) Valedictorian

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Rounding simply means turning a number into a more palatable number to work with in terms of digits while still essentially keeping the same value. Rounding is useful in doing mental math to check your work , and to make quick estimates. The round rules are if the number next to the decimal place in question is

5 or larger, round up
4 or smaller, round down. 

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llltkl | College Teacher | (Level 3) Valedictorian

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Rounding numbers means reducing the digits in a number while trying to keep it's value similar. Numbers can be rounded to the nearest ten, the nearest hundred, the nearest thousand, and so on. The result is less accurate, but easier to use.
There are several methods of rounding whole numbers, decimals. The general rule for rounding is:

1) If the number you are rounding is followed by 5, 6, 7, 8, or 9, round the number up. Example: 38 rounded to the nearest ten is 40.

2) If the number you are rounding is followed by 0, 1, 2, 3, or 4, round the number down. Example: 33 rounded to the nearest ten is 30.

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