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Subtract 20/30 from 10/42

10/42 - 20/30 is -3/7.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 30 is 210

    Next, find the equivalent fraction of both fractional numbers with denominator 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 30 × 7 = 210,
    20/30 = 20 × 7/30 × 7 = 140/210
  4. Subtract the two like fractions:
    50/210 - 140/210 = 50 - 140/210 = -90/210
  5. After reducing the fraction, the answer is -3/7

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