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Subtract 21/80 from 28/36

28/36 - 21/80 is 371/720.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 36 and 80 is 720
  2. For the 1st fraction, since 36 × 20 = 720,
    28/36 = 28 × 20/36 × 20 = 560/720
  3. Likewise, for the 2nd fraction, since 80 × 9 = 720,
    21/80 = 21 × 9/80 × 9 = 189/720
  4. Subtract the two fractions:
    560/720 - 189/720 = 560 - 189/720 = 371/720

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