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Subtract 90/63 from 21/36

1st number: 21/36, 2nd number: 1 27/63

21/36 - 90/63 is -71/84.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 36 and 63 is 252

    Next, find the equivalent fraction of both fractional numbers with denominator 252
  2. For the 1st fraction, since 36 × 7 = 252,
    21/36 = 21 × 7/36 × 7 = 147/252
  3. Likewise, for the 2nd fraction, since 63 × 4 = 252,
    90/63 = 90 × 4/63 × 4 = 360/252
  4. Subtract the two like fractions:
    147/252 - 360/252 = 147 - 360/252 = -213/252
  5. After reducing the fraction, the answer is -71/84

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