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Subtract 3/15 from 5/21

5/21 - 3/15 is 4/105.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 15 is 105

    Next, find the equivalent fraction of both fractional numbers with denominator 105
  2. For the 1st fraction, since 21 × 5 = 105,
    5/21 = 5 × 5/21 × 5 = 25/105
  3. Likewise, for the 2nd fraction, since 15 × 7 = 105,
    3/15 = 3 × 7/15 × 7 = 21/105
  4. Subtract the two like fractions:
    25/105 - 21/105 = 25 - 21/105 = 4/105

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