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Subtract 70/90 from 42/75

42/75 - 70/90 is -49/225.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 75 and 90 is 450

    Next, find the equivalent fraction of both fractional numbers with denominator 450
  2. For the 1st fraction, since 75 × 6 = 450,
    42/75 = 42 × 6/75 × 6 = 252/450
  3. Likewise, for the 2nd fraction, since 90 × 5 = 450,
    70/90 = 70 × 5/90 × 5 = 350/450
  4. Subtract the two like fractions:
    252/450 - 350/450 = 252 - 350/450 = -98/450
  5. After reducing the fraction, the answer is -49/225

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