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Subtract 3/8 from 21/80

21/80 - 3/8 is -9/80.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 8 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 8 × 10 = 80,
    3/8 = 3 × 10/8 × 10 = 30/80
  4. Subtract the two like fractions:
    21/80 - 30/80 = 21 - 30/80 = -9/80

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