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Subtract 63/21 from 9/8

1st number: 1 1/8, 2nd number: 3 0/21

9/8 - 63/21 is -15/8.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 8 and 21 is 168
  2. For the 1st fraction, since 8 × 21 = 168,
    9/8 = 9 × 21/8 × 21 = 189/168
  3. Likewise, for the 2nd fraction, since 21 × 8 = 168,
    63/21 = 63 × 8/21 × 8 = 504/168
  4. Subtract the two fractions:
    189/168 - 504/168 = 189 - 504/168 = -315/168
  5. After reducing the fraction, the answer is -15/8

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