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Subtract 4/21 from 5/15

5/15 - 4/21 is 1/7.

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,
    5/15 = 5 × 7/15 × 7 = 35/105
  3. Likewise, for the 2nd fraction, since 21 × 5 = 105,
    4/21 = 4 × 5/21 × 5 = 20/105
  4. Subtract the two like fractions:
    35/105 - 20/105 = 35 - 20/105 = 15/105
  5. After reducing the fraction, the answer is 1/7

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