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Subtract 4/8 from 4/21

4/21 - 4/8 is -13/42.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 8 is 168

    Next, find the equivalent fraction of both fractional numbers with denominator 168
  2. For the 1st fraction, since 21 × 8 = 168,
    4/21 = 4 × 8/21 × 8 = 32/168
  3. Likewise, for the 2nd fraction, since 8 × 21 = 168,
    4/8 = 4 × 21/8 × 21 = 84/168
  4. Subtract the two like fractions:
    32/168 - 84/168 = 32 - 84/168 = -52/168
  5. After reducing the fraction, the answer is -13/42

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