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Subtract 9/21 from 1/5

1/5 - 9/21 is -8/35.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 5 and 21 is 105

    Next, find the equivalent fraction of both fractional numbers with denominator 105
  2. For the 1st fraction, since 5 × 21 = 105,
    1/5 = 1 × 21/5 × 21 = 21/105
  3. Likewise, for the 2nd fraction, since 21 × 5 = 105,
    9/21 = 9 × 5/21 × 5 = 45/105
  4. Subtract the two like fractions:
    21/105 - 45/105 = 21 - 45/105 = -24/105
  5. After reducing the fraction, the answer is -8/35

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