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Subtract 42/10 from 12/9

1st number: 1 3/9, 2nd number: 4 2/10

12/9 - 42/10 is -43/15.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 9 and 10 is 90

    Next, find the equivalent fraction of both fractional numbers with denominator 90
  2. For the 1st fraction, since 9 × 10 = 90,
    12/9 = 12 × 10/9 × 10 = 120/90
  3. Likewise, for the 2nd fraction, since 10 × 9 = 90,
    42/10 = 42 × 9/10 × 9 = 378/90
  4. Subtract the two like fractions:
    120/90 - 378/90 = 120 - 378/90 = -258/90
  5. After reducing the fraction, the answer is -43/15

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