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Subtract 7/15 from 7/21

7/21 - 7/15 is -2/15.

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,
    7/21 = 7 × 5/21 × 5 = 35/105
  3. Likewise, for the 2nd fraction, since 15 × 7 = 105,
    7/15 = 7 × 7/15 × 7 = 49/105
  4. Subtract the two like fractions:
    35/105 - 49/105 = 35 - 49/105 = -14/105
  5. After reducing the fraction, the answer is -2/15

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