Beginning Pre-Algebra at Free-Ed.net

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Chapter 5 Decimals

5-3 Rounding Decimals

Rounding is especially important when you are working with decimal fractions. When doing long division with decimal values, for example, it is quite possible to come up with a decimal answer that has an endless number of digits. In such instances, we must end the sequence of digits at some reasonable point—round the results.

Example

Problem: Round 2.31862 to the nearest hundredth.

Step 1: Locate the hundredth position

2.31862

Step 2: Round up or down, according to the number immediately to the right of the specified number.

2.31862

Round up if this number is greater or equal to 5.

Round down if this number is less than 5.

This number is greater than 5 so we the round up:

2.32

Solution: 2.31862 rounded to the nearest hundredth is 2.32

Exercises

Click the ? symbol to see the correct answer.

1. 18.35026 rounded to the nearest tenth place = ?	2. 18.35026 to the nearest thousandths place = ?
3. 18.35026 to the nearest tens place = ?	4. 18.35026 to the nearest ten-thousandths place = ?
5. 18.35026 to the nearest ones place = ?

Author: David L. Heiserman
Publisher: SweetHaven Publishing Services