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Subtract 21/28 from 1/4

1/4 - 21/28 is -1/2.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 4 and 28 is 28

    Next, find the equivalent fraction of both fractional numbers with denominator 28
  2. For the 1st fraction, since 4 × 7 = 28,
    1/4 = 1 × 7/4 × 7 = 7/28
  3. Likewise, for the 2nd fraction, since 28 × 1 = 28,
    21/28 = 21 × 1/28 × 1 = 21/28
  4. Subtract the two like fractions:
    7/28 - 21/28 = 7 - 21/28 = -14/28
  5. After reducing the fraction, the answer is -1/2

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