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Subtract 4/30 from 5/42

5/42 - 4/30 is -1/70.

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,
    5/42 = 5 × 5/42 × 5 = 25/210
  3. Likewise, for the 2nd fraction, since 30 × 7 = 210,
    4/30 = 4 × 7/30 × 7 = 28/210
  4. Subtract the two fractions:
    25/210 - 28/210 = 25 - 28/210 = -3/210
  5. After reducing the fraction, the answer is -1/70

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