Lesson 2
Rounding Decimals

Rounding is especially important when working with decimal fractions. When doing long division with decimal values, for example, it is quite possible to come up with decimal answers that have an endless number of digits in the fraction part. In such instances, you must end the sequence of digits at some reasonable point—or, in other words, round off the result.

Example

Problem

Round 2.31862 to the nearest hundredth.

Procedure

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.

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

Round down if this number is less than 5.

2.31862

This number is greater than 5 so we round up:

2.32

Solution

2.31862 rounded to the nearest hundredth is 2.32

Use these interactive examples and exercises to strengthen your understanding and build your skills.

If you are having any trouble understanding the content of this lesson, you will benefit from a more detailed tutorial on the subject.