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Subtract 42/80 from 28/63

28/63 - 42/80 is -29/360.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 63 and 80 is 5040

    Next, find the equivalent fraction of both fractional numbers with denominator 5040
  2. For the 1st fraction, since 63 × 80 = 5040,
    28/63 = 28 × 80/63 × 80 = 2240/5040
  3. Likewise, for the 2nd fraction, since 80 × 63 = 5040,
    42/80 = 42 × 63/80 × 63 = 2646/5040
  4. Subtract the two like fractions:
    2240/5040 - 2646/5040 = 2240 - 2646/5040 = -406/5040
  5. After reducing the fraction, the answer is -29/360

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