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Subtract 28/20 from 2/42

1st number: 2/42, 2nd number: 1 8/20

2/42 - 28/20 is -142/105.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 20 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 42 × 10 = 420,
    2/42 = 2 × 10/42 × 10 = 20/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    28/20 = 28 × 21/20 × 21 = 588/420
  4. Subtract the two like fractions:
    20/420 - 588/420 = 20 - 588/420 = -568/420
  5. After reducing the fraction, the answer is -142/105

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