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Subtract 21/5 from 3/12

1st number: 3/12, 2nd number: 4 1/5

3/12 - 21/5 is -79/20.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 5 is 60

    Next, find the equivalent fraction of both fractional numbers with denominator 60
  2. For the 1st fraction, since 12 × 5 = 60,
    3/12 = 3 × 5/12 × 5 = 15/60
  3. Likewise, for the 2nd fraction, since 5 × 12 = 60,
    21/5 = 21 × 12/5 × 12 = 252/60
  4. Subtract the two like fractions:
    15/60 - 252/60 = 15 - 252/60 = -237/60
  5. After reducing the fraction, the answer is -79/20

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