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Subtract 3/21 from 7/15

7/15 - 3/21 is 34/105.

Steps for subtracting fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 105
  2. For the 1st fraction, since 15 × 7 = 105,
    7/15 = 7 × 7/15 × 7 = 49/105
  3. Likewise, for the 2nd fraction, since 21 × 5 = 105,
    3/21 = 3 × 5/21 × 5 = 15/105
  4. Subtract the two like fractions:
    49/105 - 15/105 = 49 - 15/105 = 34/105

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