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Subtract 90/12 from 42/15

1st number: 2 12/15, 2nd number: 7 6/12

42/15 - 90/12 is -47/10.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 12 is 60
  2. For the 1st fraction, since 15 × 4 = 60,
    42/15 = 42 × 4/15 × 4 = 168/60
  3. Likewise, for the 2nd fraction, since 12 × 5 = 60,
    90/12 = 90 × 5/12 × 5 = 450/60
  4. Subtract the two fractions:
    168/60 - 450/60 = 168 - 450/60 = -282/60
  5. After reducing the fraction, the answer is -47/10

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