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Subtract 21/81 from 75/42

1st number: 1 33/42, 2nd number: 21/81

75/42 - 21/81 is 577/378.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 81 is 1134

    Next, find the equivalent fraction of both fractional numbers with denominator 1134
  2. For the 1st fraction, since 42 × 27 = 1134,
    75/42 = 75 × 27/42 × 27 = 2025/1134
  3. Likewise, for the 2nd fraction, since 81 × 14 = 1134,
    21/81 = 21 × 14/81 × 14 = 294/1134
  4. Subtract the two like fractions:
    2025/1134 - 294/1134 = 2025 - 294/1134 = 1731/1134
  5. After reducing the fraction, the answer is 577/378
  6. In mixed form: 1199/378

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