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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:

### 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 If you need help writing proper fractions, check out:  Identify Fractions. If you need help writing mixed numbers, check out:  Identify Fractions. 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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