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Subtract 3/4 from 21/80

21/80 - 3/4 is -39/80.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 4 is 80

    Next, find the equivalent fraction of both fractional numbers with denominator 80
  2. For the 1st fraction, since 80 × 1 = 80,
    21/80 = 21 × 1/80 × 1 = 21/80
  3. Likewise, for the 2nd fraction, since 4 × 20 = 80,
    3/4 = 3 × 20/4 × 20 = 60/80
  4. Subtract the two like fractions:
    21/80 - 60/80 = 21 - 60/80 = -39/80

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