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Subtract 42/21 from 15/42

1st number: 15/42, 2nd number: 2 0/21

15/42 - 42/21 is -23/14.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 21 is 42

    Next, find the equivalent fraction of both fractional numbers with denominator 42
  2. For the 1st fraction, since 42 × 1 = 42,
    15/42 = 15 × 1/42 × 1 = 15/42
  3. Likewise, for the 2nd fraction, since 21 × 2 = 42,
    42/21 = 42 × 2/21 × 2 = 84/42
  4. Subtract the two like fractions:
    15/42 - 84/42 = 15 - 84/42 = -69/42
  5. After reducing the fraction, the answer is -23/14

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