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Subtract 20/84 from 30/42

30/42 - 20/84 is 10/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 84 is 84
  2. For the 1st fraction, since 42 × 2 = 84,
    30/42 = 30 × 2/42 × 2 = 60/84
  3. Likewise, for the 2nd fraction, since 84 × 1 = 84,
    20/84 = 20 × 1/84 × 1 = 20/84
  4. Subtract the two fractions:
    60/84 - 20/84 = 60 - 20/84 = 40/84
  5. After reducing the fraction, the answer is 10/21

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