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Subtract 21/27 from 2/3

2/3 - 21/27 is -1/9.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 3 and 27 is 27

    Next, find the equivalent fraction of both fractional numbers with denominator 27
  2. For the 1st fraction, since 3 × 9 = 27,
    2/3 = 2 × 9/3 × 9 = 18/27
  3. Likewise, for the 2nd fraction, since 27 × 1 = 27,
    21/27 = 21 × 1/27 × 1 = 21/27
  4. Subtract the two like fractions:
    18/27 - 21/27 = 18 - 21/27 = -3/27
  5. After reducing the fraction, the answer is -1/9

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