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Subtract 54/80 from 30/72

30/72 - 54/80 is -31/120.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 72 and 80 is 720

    Next, find the equivalent fraction of both fractional numbers with denominator 720
  2. For the 1st fraction, since 72 × 10 = 720,
    30/72 = 30 × 10/72 × 10 = 300/720
  3. Likewise, for the 2nd fraction, since 80 × 9 = 720,
    54/80 = 54 × 9/80 × 9 = 486/720
  4. Subtract the two like fractions:
    300/720 - 486/720 = 300 - 486/720 = -186/720
  5. After reducing the fraction, the answer is -31/120

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