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Subtract 2/4 from 8/21

8/21 - 2/4 is -5/42.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 4 is 84

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 21 × 4 = 84,
    8/21 = 8 × 4/21 × 4 = 32/84
  3. Likewise, for the 2nd fraction, since 4 × 21 = 84,
    2/4 = 2 × 21/4 × 21 = 42/84
  4. Subtract the two like fractions:
    32/84 - 42/84 = 32 - 42/84 = -10/84
  5. After reducing the fraction, the answer is -5/42

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