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Subtract 6/28 from 1/21

1/21 - 6/28 is -1/6.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 28 is 84

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 21 × 4 = 84,
    1/21 = 1 × 4/21 × 4 = 4/84
  3. Likewise, for the 2nd fraction, since 28 × 3 = 84,
    6/28 = 6 × 3/28 × 3 = 18/84
  4. Subtract the two like fractions:
    4/84 - 18/84 = 4 - 18/84 = -14/84
  5. After reducing the fraction, the answer is -1/6

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