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Subtract 1/21 from 9/80

9/80 - 1/21 is 109/1680.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 21 is 1680

    Next, find the equivalent fraction of both fractional numbers with denominator 1680
  2. For the 1st fraction, since 80 × 21 = 1680,
    9/80 = 9 × 21/80 × 21 = 189/1680
  3. Likewise, for the 2nd fraction, since 21 × 80 = 1680,
    1/21 = 1 × 80/21 × 80 = 80/1680
  4. Subtract the two like fractions:
    189/1680 - 80/1680 = 189 - 80/1680 = 109/1680

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