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Subtract 7/18 from 9/21

9/21 - 7/18 is 5/126.

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,
    7/18 = 7 × 7/18 × 7 = 49/126
  4. Subtract the two fractions:
    54/126 - 49/126 = 54 - 49/126 = 5/126

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