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Subtract 18/5 from 1/21

1st number: 1/21, 2nd number: 3 3/5

1/21 - 18/5 is -373/105.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 5 is 105

    Next, find the equivalent fraction of both fractional numbers with denominator 105
  2. For the 1st fraction, since 21 × 5 = 105,
    1/21 = 1 × 5/21 × 5 = 5/105
  3. Likewise, for the 2nd fraction, since 5 × 21 = 105,
    18/5 = 18 × 21/5 × 21 = 378/105
  4. Subtract the two like fractions:
    5/105 - 378/105 = 5 - 378/105 = -373/105

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