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Subtract 7/9 from 18/21

18/21 - 7/9 is 5/63.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 9 is 63
  2. For the 1st fraction, since 21 × 3 = 63,
    18/21 = 18 × 3/21 × 3 = 54/63
  3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
    7/9 = 7 × 7/9 × 7 = 49/63
  4. Subtract the two fractions:
    54/63 - 49/63 = 54 - 49/63 = 5/63

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