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Subtract 90/72 from 15/50

1st number: 15/50, 2nd number: 1 18/72

15/50 - 90/72 is -19/20.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 50 and 72 is 1800

    Next, find the equivalent fraction of both fractional numbers with denominator 1800
  2. For the 1st fraction, since 50 × 36 = 1800,
    15/50 = 15 × 36/50 × 36 = 540/1800
  3. Likewise, for the 2nd fraction, since 72 × 25 = 1800,
    90/72 = 90 × 25/72 × 25 = 2250/1800
  4. Subtract the two like fractions:
    540/1800 - 2250/1800 = 540 - 2250/1800 = -1710/1800
  5. After reducing the fraction, the answer is -19/20

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