Adding and subtracting fractions

With common denominator (easy)

No common denominator

  • Find the LCD - this is the LCM of all denominators
  • Transform each fraction into an equivalent fraction where the LCD is its denominator
  • Perform the indicated operation (addition or subtraction) with the numerators only
  • Place the result over the common denominator
  • Simplify the fraction
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Table Of Contents
Adding and subtracting fractions
With common denominator (easy)
No common denominator