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Subtract 21/12 from 7/28

1st number: 7/28, 2nd number: 1 9/12

7/28 - 21/12 is -3/2.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 12 is 84

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 28 × 3 = 84,
    7/28 = 7 × 3/28 × 3 = 21/84
  3. Likewise, for the 2nd fraction, since 12 × 7 = 84,
    21/12 = 21 × 7/12 × 7 = 147/84
  4. Subtract the two like fractions:
    21/84 - 147/84 = 21 - 147/84 = -126/84
  5. After reducing the fraction, the answer is -3/2

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