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Subtract 7/80 from 1/21

1/21 - 7/80 is -67/1680.

Steps for subtracting fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 1680
  2. For the 1st fraction, since 21 × 80 = 1680,
    1/21 = 1 × 80/21 × 80 = 80/1680
  3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
    7/80 = 7 × 21/80 × 21 = 147/1680
  4. Subtract the two like fractions:
    80/1680 - 147/1680 = 80 - 147/1680 = -67/1680

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