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Subtract 18/42 from 9/20

9/20 - 18/42 is 3/140.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 42 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 20 × 21 = 420,
    9/20 = 9 × 21/20 × 21 = 189/420
  3. Likewise, for the 2nd fraction, since 42 × 10 = 420,
    18/42 = 18 × 10/42 × 10 = 180/420
  4. Subtract the two like fractions:
    189/420 - 180/420 = 189 - 180/420 = 9/420
  5. After reducing the fraction, the answer is 3/140

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