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Subtract 42/50 from 12/45

12/45 - 42/50 is -43/75.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 45 and 50 is 450
  2. For the 1st fraction, since 45 × 10 = 450,
    12/45 = 12 × 10/45 × 10 = 120/450
  3. Likewise, for the 2nd fraction, since 50 × 9 = 450,
    42/50 = 42 × 9/50 × 9 = 378/450
  4. Subtract the two fractions:
    120/450 - 378/450 = 120 - 378/450 = -258/450
  5. After reducing the fraction, the answer is -43/75

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