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Subtract 1/5 from 1/21

1/21 - 1/5 is -16/105.

Steps for subtracting fractions

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

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