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Subtract 12/20 from 21/5

1st number: 4 1/5, 2nd number: 12/20

21/5 - 12/20 is 18/5.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 5 and 20 is 20

    Next, find the equivalent fraction of both fractional numbers with denominator 20
  2. For the 1st fraction, since 5 × 4 = 20,
    21/5 = 21 × 4/5 × 4 = 84/20
  3. Likewise, for the 2nd fraction, since 20 × 1 = 20,
    12/20 = 12 × 1/20 × 1 = 12/20
  4. Subtract the two like fractions:
    84/20 - 12/20 = 84 - 12/20 = 72/20
  5. After reducing the fraction, the answer is 18/5
  6. In mixed form: 33/5

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