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Subtract 8/4 from 3/21

1st number: 3/21, 2nd number: 2 0/4

3/21 - 8/4 is -13/7.

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,
    3/21 = 3 × 4/21 × 4 = 12/84
  3. Likewise, for the 2nd fraction, since 4 × 21 = 84,
    8/4 = 8 × 21/4 × 21 = 168/84
  4. Subtract the two like fractions:
    12/84 - 168/84 = 12 - 168/84 = -156/84
  5. After reducing the fraction, the answer is -13/7

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