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Subtract 9/30 from 9/42

9/42 - 9/30 is -3/35.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 30 is 210
  2. For the 1st fraction, since 42 × 5 = 210,
    9/42 = 9 × 5/42 × 5 = 45/210
  3. Likewise, for the 2nd fraction, since 30 × 7 = 210,
    9/30 = 9 × 7/30 × 7 = 63/210
  4. Subtract the two fractions:
    45/210 - 63/210 = 45 - 63/210 = -18/210
  5. After reducing the fraction, the answer is -3/35

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