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Subtract 90/50 from 28/40

1st number: 28/40, 2nd number: 1 40/50

28/40 - 90/50 is -11/10.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 50 is 200

    Next, find the equivalent fraction of both fractional numbers with denominator 200
  2. For the 1st fraction, since 40 × 5 = 200,
    28/40 = 28 × 5/40 × 5 = 140/200
  3. Likewise, for the 2nd fraction, since 50 × 4 = 200,
    90/50 = 90 × 4/50 × 4 = 360/200
  4. Subtract the two like fractions:
    140/200 - 360/200 = 140 - 360/200 = -220/200
  5. After reducing the fraction, the answer is -11/10

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