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Subtract 70/90 from 18/25

18/25 - 70/90 is -13/225.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 25 and 90 is 450

    Next, find the equivalent fraction of both fractional numbers with denominator 450
  2. For the 1st fraction, since 25 × 18 = 450,
    18/25 = 18 × 18/25 × 18 = 324/450
  3. Likewise, for the 2nd fraction, since 90 × 5 = 450,
    70/90 = 70 × 5/90 × 5 = 350/450
  4. Subtract the two like fractions:
    324/450 - 350/450 = 324 - 350/450 = -26/450
  5. After reducing the fraction, the answer is -13/225

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