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Subtract 90/42 from 18/15

1st number: 1 3/15, 2nd number: 2 6/42

18/15 - 90/42 is -33/35.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 42 is 210
  2. For the 1st fraction, since 15 × 14 = 210,
    18/15 = 18 × 14/15 × 14 = 252/210
  3. Likewise, for the 2nd fraction, since 42 × 5 = 210,
    90/42 = 90 × 5/42 × 5 = 450/210
  4. Subtract the two fractions:
    252/210 - 450/210 = 252 - 450/210 = -198/210
  5. After reducing the fraction, the answer is -33/35

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