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Subtract 5/54 from 18/21

18/21 - 5/54 is 289/378.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 54 is 378

    Next, find the equivalent fraction of both fractional numbers with denominator 378
  2. For the 1st fraction, since 21 × 18 = 378,
    18/21 = 18 × 18/21 × 18 = 324/378
  3. Likewise, for the 2nd fraction, since 54 × 7 = 378,
    5/54 = 5 × 7/54 × 7 = 35/378
  4. Subtract the two like fractions:
    324/378 - 35/378 = 324 - 35/378 = 289/378

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