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Subtract 1/80 from 7/21

7/21 - 1/80 is 77/240.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 80 is 1680
  2. For the 1st fraction, since 21 × 80 = 1680,
    7/21 = 7 × 80/21 × 80 = 560/1680
  3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
    1/80 = 1 × 21/80 × 21 = 21/1680
  4. Subtract the two fractions:
    560/1680 - 21/1680 = 560 - 21/1680 = 539/1680
  5. After reducing the fraction, the answer is 77/240

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