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Subtract 15/18 from 42/20

1st number: 2 2/20, 2nd number: 15/18

42/20 - 15/18 is 19/15.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 18 is 180

    Next, find the equivalent fraction of both fractional numbers with denominator 180
  2. For the 1st fraction, since 20 × 9 = 180,
    42/20 = 42 × 9/20 × 9 = 378/180
  3. Likewise, for the 2nd fraction, since 18 × 10 = 180,
    15/18 = 15 × 10/18 × 10 = 150/180
  4. Subtract the two like fractions:
    378/180 - 150/180 = 378 - 150/180 = 228/180
  5. After reducing the fraction, the answer is 19/15
  6. In mixed form: 14/15

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