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Subtract 4/7 from 1/21

1/21 - 4/7 is -11/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 7 is 21

    Next, find the equivalent fraction of both fractional numbers with denominator 21
  2. For the 1st fraction, since 21 × 1 = 21,
    1/21 = 1 × 1/21 × 1 = 1/21
  3. Likewise, for the 2nd fraction, since 7 × 3 = 21,
    4/7 = 4 × 3/7 × 3 = 12/21
  4. Subtract the two like fractions:
    1/21 - 12/21 = 1 - 12/21 = -11/21

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