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Subtract 90/18 from 42/15

1st number: 2 12/15, 2nd number: 5 0/18

42/15 - 90/18 is -11/5.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 18 is 90
  2. For the 1st fraction, since 15 × 6 = 90,
    42/15 = 42 × 6/15 × 6 = 252/90
  3. Likewise, for the 2nd fraction, since 18 × 5 = 90,
    90/18 = 90 × 5/18 × 5 = 450/90
  4. Subtract the two fractions:
    252/90 - 450/90 = 252 - 450/90 = -198/90
  5. After reducing the fraction, the answer is -11/5

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