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Subtract 4/21 from 7/84

7/84 - 4/21 is -3/28.

Steps for subtracting fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 84 × 1 = 84,
    7/84 = 7 × 1/84 × 1 = 7/84
  3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
    4/21 = 4 × 4/21 × 4 = 16/84
  4. Subtract the two like fractions:
    7/84 - 16/84 = 7 - 16/84 = -9/84
  5. After reducing the fraction, the answer is -3/28

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