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Subtract 90/18 from 12/15

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

12/15 - 90/18 is -21/5.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 18 is 90

    Next, find the equivalent fraction of both fractional numbers with denominator 90
  2. For the 1st fraction, since 15 × 6 = 90,
    12/15 = 12 × 6/15 × 6 = 72/90
  3. Likewise, for the 2nd fraction, since 18 × 5 = 90,
    90/18 = 90 × 5/18 × 5 = 450/90
  4. Subtract the two like fractions:
    72/90 - 450/90 = 72 - 450/90 = -378/90
  5. After reducing the fraction, the answer is -21/5

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