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Subtract 8/21 from 8/15

8/15 - 8/21 is 16/105.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 21 is 105
  2. For the 1st fraction, since 15 × 7 = 105,
    8/15 = 8 × 7/15 × 7 = 56/105
  3. Likewise, for the 2nd fraction, since 21 × 5 = 105,
    8/21 = 8 × 5/21 × 5 = 40/105
  4. Subtract the two fractions:
    56/105 - 40/105 = 56 - 40/105 = 16/105

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