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Subtract 49/18 from 9/21

1st number: 9/21, 2nd number: 2 13/18

9/21 - 49/18 is -289/126.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 18 is 126
  2. For the 1st fraction, since 21 × 6 = 126,
    9/21 = 9 × 6/21 × 6 = 54/126
  3. Likewise, for the 2nd fraction, since 18 × 7 = 126,
    49/18 = 49 × 7/18 × 7 = 343/126
  4. Subtract the two fractions:
    54/126 - 343/126 = 54 - 343/126 = -289/126

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