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Subtract 21/30 from 12/18

12/18 - 21/30 is -1/30.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 30 is 90

    Next, find the equivalent fraction of both fractional numbers with denominator 90
  2. For the 1st fraction, since 18 × 5 = 90,
    12/18 = 12 × 5/18 × 5 = 60/90
  3. Likewise, for the 2nd fraction, since 30 × 3 = 90,
    21/30 = 21 × 3/30 × 3 = 63/90
  4. Subtract the two like fractions:
    60/90 - 63/90 = 60 - 63/90 = -3/90
  5. After reducing the fraction, the answer is -1/30

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