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Subtract 28/20 from 5/42

1st number: 5/42, 2nd number: 1 8/20

5/42 - 28/20 is -269/210.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 20 is 420
  2. For the 1st fraction, since 42 × 10 = 420,
    5/42 = 5 × 10/42 × 10 = 50/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    28/20 = 28 × 21/20 × 21 = 588/420
  4. Subtract the two fractions:
    50/420 - 588/420 = 50 - 588/420 = -538/420
  5. After reducing the fraction, the answer is -269/210

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