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Subtract 28/20 from 21/25

1st number: 21/25, 2nd number: 1 8/20

21/25 - 28/20 is -14/25.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 25 and 20 is 100

    Next, find the equivalent fraction of both fractional numbers with denominator 100
  2. For the 1st fraction, since 25 × 4 = 100,
    21/25 = 21 × 4/25 × 4 = 84/100
  3. Likewise, for the 2nd fraction, since 20 × 5 = 100,
    28/20 = 28 × 5/20 × 5 = 140/100
  4. Subtract the two like fractions:
    84/100 - 140/100 = 84 - 140/100 = -56/100
  5. After reducing the fraction, the answer is -14/25

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