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Subtract 21/25 from 20/28

20/28 - 21/25 is -22/175.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 25 is 700

    Next, find the equivalent fraction of both fractional numbers with denominator 700
  2. For the 1st fraction, since 28 × 25 = 700,
    20/28 = 20 × 25/28 × 25 = 500/700
  3. Likewise, for the 2nd fraction, since 25 × 28 = 700,
    21/25 = 21 × 28/25 × 28 = 588/700
  4. Subtract the two like fractions:
    500/700 - 588/700 = 500 - 588/700 = -88/700
  5. After reducing the fraction, the answer is -22/175

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