Learn on PengienVision, Mathematics, Grade 4Chapter 9: Understand Addition and Subtraction of Fractions

Lesson 5: Subtract Fractions with Like Denominators

Property.

Section 1

Subtracting Fractions with Common Denominators

Property

To subtract rational numbers with the same denominator, subtract the numerators and keep the common denominator: ab−cb=a−cb\frac{a}{b} - \frac{c}{b} = \frac{a-c}{b}.

Examples

Lesson overview

Expand to review the lesson summary and core properties.

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Section 1

Subtracting Fractions with Common Denominators

Property

To subtract rational numbers with the same denominator, subtract the numerators and keep the common denominator: ab−cb=a−cb\frac{a}{b} - \frac{c}{b} = \frac{a-c}{b}.

Examples