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Subtract 90/21 from 63/56

1st number: 1 7/56, 2nd number: 4 6/21

63/56 - 90/21 is -177/56.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 56 and 21 is 168
  2. For the 1st fraction, since 56 × 3 = 168,
    63/56 = 63 × 3/56 × 3 = 189/168
  3. Likewise, for the 2nd fraction, since 21 × 8 = 168,
    90/21 = 90 × 8/21 × 8 = 720/168
  4. Subtract the two fractions:
    189/168 - 720/168 = 189 - 720/168 = -531/168
  5. After reducing the fraction, the answer is -177/56

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