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Study Guides > Prealgebra

Summary: Adding and Subtracting Fractions With Common Denominators

 

Key Concepts

  • Fraction Addition
    • If [latex]a,b[/latex], and [latex]c[/latex] are numbers where [latex]c\ne 0[/latex] , then [latex]\frac{a}{c}+\frac{b}{c}=\frac{a+c}{c}[/latex] .
    • To add fractions, add the numerators and place the sum over the common denominator.
  • Fraction Subtraction
    • If [latex]a,b[/latex], and [latex]c[/latex] are numbers where [latex]c\ne 0[/latex] , then [latex]\frac{a}{c}-\frac{b}{c}=\frac{a-c}{c}[/latex] .
    • To subtract fractions, subtract the numerators and place the difference over the common denominator.

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