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Subtract 28/10 from 21/25

1st number: 21/25, 2nd number: 2 8/10

21/25 - 28/10 is -49/25.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 25 and 10 is 50

    Next, find the equivalent fraction of both fractional numbers with denominator 50
  2. For the 1st fraction, since 25 × 2 = 50,
    21/25 = 21 × 2/25 × 2 = 42/50
  3. Likewise, for the 2nd fraction, since 10 × 5 = 50,
    28/10 = 28 × 5/10 × 5 = 140/50
  4. Subtract the two like fractions:
    42/50 - 140/50 = 42 - 140/50 = -98/50
  5. After reducing the fraction, the answer is -49/25

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