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# What are the rules for rounding in math?

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### Quick Answer

As a general rule of thumb, numbers should be rounded down if the final digit in a number is from 0 to 4, and rounded up if it's 5 to 9. Rounding sometimes involves more than one digit; some situations may call for rounding to the nearest hundred or thousand.

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### Full Answer

Rounding is useful in academic mathematics courses as well as in practical situations in real life. For example if an item costs \$1.99 and another item costs \$2.49, it is beneficial to estimate their respective costs as \$2.00 and \$2.50, especially when keeping track of a fixed amount of money available to make purchases.

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