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Subtract 90/18 from 27/42

1st number: 27/42, 2nd number: 5 0/18

27/42 - 90/18 is -61/14.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 18 is 126

    Next, find the equivalent fraction of both fractional numbers with denominator 126
  2. For the 1st fraction, since 42 × 3 = 126,
    27/42 = 27 × 3/42 × 3 = 81/126
  3. Likewise, for the 2nd fraction, since 18 × 7 = 126,
    90/18 = 90 × 7/18 × 7 = 630/126
  4. Subtract the two like fractions:
    81/126 - 630/126 = 81 - 630/126 = -549/126
  5. After reducing the fraction, the answer is -61/14

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