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Subtract 18/5 from 1/42

1st number: 1/42, 2nd number: 3 3/5

1/42 - 18/5 is -751/210.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 5 is 210

    Next, find the equivalent fraction of both fractional numbers with denominator 210
  2. For the 1st fraction, since 42 × 5 = 210,
    1/42 = 1 × 5/42 × 5 = 5/210
  3. Likewise, for the 2nd fraction, since 5 × 42 = 210,
    18/5 = 18 × 42/5 × 42 = 756/210
  4. Subtract the two like fractions:
    5/210 - 756/210 = 5 - 756/210 = -751/210

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