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Subtract 72/50 from 18/90

1st number: 18/90, 2nd number: 1 22/50

18/90 - 72/50 is -31/25.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 50 is 450

    Next, find the equivalent fraction of both fractional numbers with denominator 450
  2. For the 1st fraction, since 90 × 5 = 450,
    18/90 = 18 × 5/90 × 5 = 90/450
  3. Likewise, for the 2nd fraction, since 50 × 9 = 450,
    72/50 = 72 × 9/50 × 9 = 648/450
  4. Subtract the two like fractions:
    90/450 - 648/450 = 90 - 648/450 = -558/450
  5. After reducing the fraction, the answer is -31/25

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