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Subtract 10/21 from 1/3

1/3 - 10/21 is -1/7.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 3 and 21 is 21

    Next, find the equivalent fraction of both fractional numbers with denominator 21
  2. For the 1st fraction, since 3 × 7 = 21,
    1/3 = 1 × 7/3 × 7 = 7/21
  3. Likewise, for the 2nd fraction, since 21 × 1 = 21,
    10/21 = 10 × 1/21 × 1 = 10/21
  4. Subtract the two like fractions:
    7/21 - 10/21 = 7 - 10/21 = -3/21
  5. After reducing the fraction, the answer is -1/7

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