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Subtract 21/30 from 12/54

12/54 - 21/30 is -43/90.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 54 and 30 is 270

    Next, find the equivalent fraction of both fractional numbers with denominator 270
  2. For the 1st fraction, since 54 × 5 = 270,
    12/54 = 12 × 5/54 × 5 = 60/270
  3. Likewise, for the 2nd fraction, since 30 × 9 = 270,
    21/30 = 21 × 9/30 × 9 = 189/270
  4. Subtract the two like fractions:
    60/270 - 189/270 = 60 - 189/270 = -129/270
  5. After reducing the fraction, the answer is -43/90

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