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Subtract 12/3 from 21/18

1st number: 1 3/18, 2nd number: 4 0/3

21/18 - 12/3 is -17/6.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 3 is 18

    Next, find the equivalent fraction of both fractional numbers with denominator 18
  2. For the 1st fraction, since 18 × 1 = 18,
    21/18 = 21 × 1/18 × 1 = 21/18
  3. Likewise, for the 2nd fraction, since 3 × 6 = 18,
    12/3 = 12 × 6/3 × 6 = 72/18
  4. Subtract the two like fractions:
    21/18 - 72/18 = 21 - 72/18 = -51/18
  5. After reducing the fraction, the answer is -17/6

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