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Subtract 98/18 from 9/21

1st number: 9/21, 2nd number: 5 8/18

9/21 - 98/18 is -316/63.

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,
    98/18 = 98 × 7/18 × 7 = 686/126
  4. Subtract the two fractions:
    54/126 - 686/126 = 54 - 686/126 = -632/126
  5. After reducing the fraction, the answer is -316/63

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