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Subtract 30/12 from 5/21

1st number: 5/21, 2nd number: 2 6/12

5/21 - 30/12 is -95/42.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 12 is 84

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 21 × 4 = 84,
    5/21 = 5 × 4/21 × 4 = 20/84
  3. Likewise, for the 2nd fraction, since 12 × 7 = 84,
    30/12 = 30 × 7/12 × 7 = 210/84
  4. Subtract the two like fractions:
    20/84 - 210/84 = 20 - 210/84 = -190/84
  5. After reducing the fraction, the answer is -95/42

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