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Subtract 40/70 from 30/42

30/42 - 40/70 is 1/7.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 70 is 210
  2. For the 1st fraction, since 42 × 5 = 210,
    30/42 = 30 × 5/42 × 5 = 150/210
  3. Likewise, for the 2nd fraction, since 70 × 3 = 210,
    40/70 = 40 × 3/70 × 3 = 120/210
  4. Subtract the two fractions:
    150/210 - 120/210 = 150 - 120/210 = 30/210
  5. After reducing the fraction, the answer is 1/7

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