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Subtract 5/7 from 20/30

20/30 - 5/7 is -1/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 30 and 7 is 210

    Next, find the equivalent fraction of both fractional numbers with denominator 210
  2. For the 1st fraction, since 30 × 7 = 210,
    20/30 = 20 × 7/30 × 7 = 140/210
  3. Likewise, for the 2nd fraction, since 7 × 30 = 210,
    5/7 = 5 × 30/7 × 30 = 150/210
  4. Subtract the two like fractions:
    140/210 - 150/210 = 140 - 150/210 = -10/210
  5. After reducing the fraction, the answer is -1/21

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