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Subtract 21/4 from 18/12

1st number: 1 6/12, 2nd number: 5 1/4

18/12 - 21/4 is -15/4.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 4 is 12

    Next, find the equivalent fraction of both fractional numbers with denominator 12
  2. For the 1st fraction, since 12 × 1 = 12,
    18/12 = 18 × 1/12 × 1 = 18/12
  3. Likewise, for the 2nd fraction, since 4 × 3 = 12,
    21/4 = 21 × 3/4 × 3 = 63/12
  4. Subtract the two like fractions:
    18/12 - 63/12 = 18 - 63/12 = -45/12
  5. After reducing the fraction, the answer is -15/4

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