Summary: Adding and Subtracting Fractions With Common Denominators

Key Concepts

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

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