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Subtract 7/40 from 3/84

3/84 - 7/40 is -39/280.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 40 is 840

    Next, find the equivalent fraction of both fractional numbers with denominator 840
  2. For the 1st fraction, since 84 × 10 = 840,
    3/84 = 3 × 10/84 × 10 = 30/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    7/40 = 7 × 21/40 × 21 = 147/840
  4. Subtract the two like fractions:
    30/840 - 147/840 = 30 - 147/840 = -117/840
  5. After reducing the fraction, the answer is -39/280

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