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Subtract 2/8 from 4/21

4/21 - 2/8 is -5/84.

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,
    4/21 = 4 × 8/21 × 8 = 32/168
  3. Likewise, for the 2nd fraction, since 8 × 21 = 168,
    2/8 = 2 × 21/8 × 21 = 42/168
  4. Subtract the two fractions:
    32/168 - 42/168 = 32 - 42/168 = -10/168
  5. After reducing the fraction, the answer is -5/84

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