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Subtract 8/21 from 1/28

1/28 - 8/21 is -29/84.

Steps for subtracting fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 28 × 3 = 84,
    1/28 = 1 × 3/28 × 3 = 3/84
  3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
    8/21 = 8 × 4/21 × 4 = 32/84
  4. Subtract the two like fractions:
    3/84 - 32/84 = 3 - 32/84 = -29/84

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