Rounding numbers

is wayCOOL!

MathRocks

Rounding Numbers

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Why do we round a number and why is rounding important?Rounding makes the number simpler, but keeps its value close to what it was? Example: 73 rounded to the nearest ten is 70, because 73 is closer to 70 than to 80. But 76 goes up to 80.73 -----------70 76------------80

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Another reason rounding is important: Rounding is a way of estimating, which can be a handy tool in everyday life. You can estimate money, lenghts of time, distances, and can help you in adding numbers.

Rounding Rules1. Find the place value you want (the "rounding digit") and look to the digit just to the right of it.2. If that digit is less than 5, do not change the "rounding digit" but change all digits to the right of the "rounding digit" to zero. 3. If that digit is greater than or equal to 5, add one to the rounding digit and change all digits to the right of the rounding digit to zero. 32,547 537,890 5,678