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Subtract 4/8 from 1/21

1/21 - 4/8 is -19/42.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 8 is 168
  2. For the 1st fraction, since 21 × 8 = 168,
    1/21 = 1 × 8/21 × 8 = 8/168
  3. Likewise, for the 2nd fraction, since 8 × 21 = 168,
    4/8 = 4 × 21/8 × 21 = 84/168
  4. Subtract the two fractions:
    8/168 - 84/168 = 8 - 84/168 = -76/168
  5. After reducing the fraction, the answer is -19/42

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