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Subtract 3/9 from 30/42

30/42 - 3/9 is 8/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 9 is 126
  2. For the 1st fraction, since 42 × 3 = 126,
    30/42 = 30 × 3/42 × 3 = 90/126
  3. Likewise, for the 2nd fraction, since 9 × 14 = 126,
    3/9 = 3 × 14/9 × 14 = 42/126
  4. Subtract the two fractions:
    90/126 - 42/126 = 90 - 42/126 = 48/126
  5. After reducing the fraction, the answer is 8/21

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