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Subtract 20/6 from 15/21

1st number: 15/21, 2nd number: 3 2/6

15/21 - 20/6 is -55/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 6 is 42

    Next, find the equivalent fraction of both fractional numbers with denominator 42
  2. For the 1st fraction, since 21 × 2 = 42,
    15/21 = 15 × 2/21 × 2 = 30/42
  3. Likewise, for the 2nd fraction, since 6 × 7 = 42,
    20/6 = 20 × 7/6 × 7 = 140/42
  4. Subtract the two like fractions:
    30/42 - 140/42 = 30 - 140/42 = -110/42
  5. After reducing the fraction, the answer is -55/21

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