Back ] Up ] Next ] [Timeline]

Grade 7:  The Learning Equation Math

11.08 Terminating and Repeating Decimals

Number Concepts

Refresher pp 16-17

Learning Outcomes:

The student will:

Review Methods for Converting Fractions to Decimals
Convert fraction to an equivalent fraction with a denominator that is a power of ten before converting to a decimal.

1/2 = 5/10 = 0.5

3/20 = 15/100 = 0.15

1/8 = 125/1000 = 0.125

The decimal equivalent of a proper or improper fraction can be calculated by dividing the numerator by the denominator.  The result will be a terminating or repeating decimal.

3/4 = 0.75

terminating decimal

3/8 = 0.375

terminating decimal

4/15 = 0.0666...

repeating decimal

 

Method for Converting Terminating Decimals to Fractions
Use place value to convert the terminating decimal to a fraction that is a power of ten.  Reduce to lowest terms.

The denominator of a fraction converted from a terminating decimal will be a multiple of 2 and/or 5.

0.5 = 5/10 = 1/2

0.2 = 2/10 = 1/5

0.15 = 15/100 = 3/20

0.125 = 125/1000 = 1/8

 

Click the button below. Enter the decimal number you want to convert here, then click the "Convert it" button.
 
 
 

 

Methods for Converting Single-digit Decimal Numbers to Fractions
To understand this lesson you need to understand what a single-digit repeating decimal number is.

 

Single-digit Repeating Decimal Numbers

0.111...
0.222...
0.333...
0.444...
0.555...
0.666...
0.777...
0.888...
Study the pattern when 9 is the denominator of a fraction.

Click Reload/Refresh if the calculator does not display properly.

Complete the numerator divided by the denominator calculation with a calculator.   These are the quotients you should see when 9 is the denominator.
 
1/9 = 1 1203.h17.jpg (931 bytes) 9 = 0.111...
2/9 = 2 1203.h17.jpg (931 bytes) 9 = 0.222...
3/9 = 3 1203.h17.jpg (931 bytes) 9 = 0.333...
4/9 = 4 1203.h17.jpg (931 bytes) 9 = 0.444...
5/9 = 5 1203.h17.jpg (931 bytes) 9 = 0.555...
6/9 = 6 1203.h17.jpg (931 bytes) 9 = 0.666...
7/9 = 7 1203.h17.jpg (931 bytes) 9 = 0.777...
8/9 = 8 1203.h17.jpg (931 bytes) 9 = 0.888...

Any single-digit repeating decimal  number can be written as a fraction with 9 as the denominator and the repeating single-digit as the numerator.

0.111... = 1/9
0.222... = 2/9
0.333... = 3/9
0.444... = 4/9
0.555... = 5/9
0.666... = 6/9
0.777... = 7/9
0.888... = 8/9

 

Review:

 

 

Enrichment:

This lesson was limited to converting single-digit repeating decimal numbers to fractions using patterns.  If you wish to learn how to convert other repeating decimals to fractions, try the convertor below:

Decimal to Fraction Convertor

Click th button below. Enter the decimal number you want to convert here, then click the "Convert it" button.
 
 
 

Notes:

If you are trying to convert a repeating decimal into a fraction, enter at least two (or more!) repetitions of the repeating part of your decimal.  For instance, if you are trying to convert:

0.676767...

into a fraction, enter at least 0.6767 (try 0.676767 also).

 

place value, greatest common factor (GCF), mixed number, terminating decimal, repeating decimal, simplest terms.

Prerequisite Skills:

Decimal Conversions:  Grade 7 Lesson 11.05

Ordering Numbers:  Grade 7 Lesson 11.07

GCF Calculator

  • Click the button below
  • Enter the integers whose GCF you want to find in the box provided.
  • Separate each number with a comma.
  • You must enter at least two numbers.
  • Click the "GCF" button when done.

Fraction Conversions:  Grade 7 Lesson 11.05

 

 

Back ] Up ] Next ] [Timeline]

Comments to:  Jim Reed
Started September, 1998. Copyright 1999, 2000

Hit Counter visitors since September 3, 2000