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Subtract 28/54 from 21/35

21/35 - 28/54 is 11/135.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 35 and 54 is 1890

    Next, find the equivalent fraction of both fractional numbers with denominator 1890
  2. For the 1st fraction, since 35 × 54 = 1890,
    21/35 = 21 × 54/35 × 54 = 1134/1890
  3. Likewise, for the 2nd fraction, since 54 × 35 = 1890,
    28/54 = 28 × 35/54 × 35 = 980/1890
  4. Subtract the two like fractions:
    1134/1890 - 980/1890 = 1134 - 980/1890 = 154/1890
  5. After reducing the fraction, the answer is 11/135

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