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Grade 8:  The Learning Equation Math

12.04 Subtracting Fractions (Unlike Denominators)

Number Operations

Refresher pp 18-19

Learning Outcomes:

The student will:

subtract2_frac.gif (23533 bytes)

Subtracting Proper/Improper Fractions with Unlike Denominators

minuend - subtrahend = difference

1.  When the denominators are different determine the lowest common denominator (LCD).

2.  Change each fraction to an equivalent fraction with the LCD.

3.  Add the numerator in the subtrahen from the numerator in the minuend and place the difference over the LCD.

4.  Reduce to lowest terms.

Compare Fractions

Integer Bars (Cusenaire Rods): Learning Fractions

Pattern Blocks: Exploring Fractions with Shapes

Equivalent Fractions Game

 

Subtracting Fractions with Unlike Denominators Instructions

The Minuend and Subtrahend must be entered before the Explain button works

The difference must be written as a mixed number and in lowest terms .

From Richard E. Rand's: VISUAL FRACTIONS

 

Enter the answers.   Click on the Help button if you need assistance.

source:  NSU-Math 1030 Unit 2 Section 3  Author

 

Subtracting Fractions Calculator

Webmath.com: Subtracting Fractions

 

 

Review:

FunBrain.com's Soccer Shootout - choose subtraction (easy, medium, hard)

Fractions Drills - choose subtraction.  Try Level 2 first.

Adding/Subtraction Fraction Quiz

Adding and Subtracting Fractions

 

Enrichment:

 

Key Terms:

difference, minuend, subtrahend, numerator, denominator, least common denominator (LCD), multiple, simplest terms, proper fraction, improper fraction, mixed number, equivalent fractions

Prerequisite Skills:

Adding Fractions with Unlike Denominators:  Grade 8 Lesson 12.03

Proper Fractions - Converting Fractions:  Grade 7 Lesson 11.05

Mixed Numbers & Improper Fractions - Converting Fractions:  Grade 7 Lesson 11.05

Adding Fractions with Unlike Denominators:  Grade 8 Lesson 12.03

Equivalent Fractions Game

Adding and Subtracting Fractions (Like Denominators):  Grade 8 Lesson 12.02

Adding Fractions:  Grade 8 Lesson 12.03

Converting Fractions:  Grade 7 Lesson 11.05

 

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