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Subtract 30/70 from 10/42

10/42 - 30/70 is -4/21.

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,
    10/42 = 10 × 5/42 × 5 = 50/210
  3. Likewise, for the 2nd fraction, since 70 × 3 = 210,
    30/70 = 30 × 3/70 × 3 = 90/210
  4. Subtract the two fractions:
    50/210 - 90/210 = 50 - 90/210 = -40/210
  5. After reducing the fraction, the answer is -4/21

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