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Subtract 45/21 from 54/80

1st number: 54/80, 2nd number: 2 3/21

54/80 - 45/21 is -411/280.

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,
    54/80 = 54 × 21/80 × 21 = 1134/1680
  3. Likewise, for the 2nd fraction, since 21 × 80 = 1680,
    45/21 = 45 × 80/21 × 80 = 3600/1680
  4. Subtract the two like fractions:
    1134/1680 - 3600/1680 = 1134 - 3600/1680 = -2466/1680
  5. After reducing the fraction, the answer is -411/280

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