Converting Percentages to Decimals

Image Source: http://www.enasco.com

The above picture shows some Decimal Tiles available for overhead projectors from www.enasco.com. Enasco also have a range of Percentage and Fractions tiles for sale on their Math Resources website.

We need to be able to convert Percentages to Decimals to obtain “Multiplying Factors” for mathematics questions.

For example, if there is a Discount of 25% on an item, then we can multiply the item’s price by 0.25 to work out the dollar amount of Discount.

How did we know that 25% equals Decimal 0.25 ?

We worked out the value of 0.25 by moving the decimal place of 25.% two places to the left, which is the same as dividing 25 by 100 on a calculator.

This lesson is all about Converting Percentages into Decimals

How to Convert to Decimal Values

Changing a Percentage value into a decimal value involves dividing the Percentage by 100.

This can be very easily done using a calculator.

Without using a calculator converting is still a simple process.

All we need to do are the following steps.

Image Copyright 2012 by Passy’s World

Converting to Decimal Values

The following examples show the main types of questions that involve changing a Percentage into its Decimal quivalent value.

Image Copyright 2012 by Passy’s World

Video on Percent to Decimal

The following video by Your Teacher .com and shows how to move the decimal point 2 places to the left to make a percent into a decimal.

Video on Percentages to Decimals

The following video by Khan Academy shows how to move the decimal point 2 places to the left to make any percent value into a decimal.

Percents to Decimals Worksheet

On this worksheet, only do the Part C questions:

http://teachingimage.com/percentages-worksheets/changing-percentages-into-fractions-and-decimals.pdf

Answers:

http://teachingimage.com/percentages-worksheets/changing-percentages-into-fractions-and-decimals-answers.pdf

Maths Goodies Lesson and Online Quiz

Read through the following lesson on converting Percentages to Decimals, and then do the Online Quiz at the end of the lesson.

http://www.mathgoodies.com/lessons/vol4/percents_to_decimals.html

Percents to Decimals Time Trial Game

In this Time Trial activity, we type the answer in the answer box and then press enter, (or click the check box). We are then given immediate feedback about our answer. At the end of the time we get a % accuracy score for our work.

http://www.xpmath.com/forums/arcade.php?do=play&gameid=31

Related Items

Introduction to Percentages
Converting Percentages to Fractions
Interesting Percentages
Percentages and Weight Training
Decimals and Percentages Games

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Passy