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Subtract 4/10 from 3/84

3/84 - 4/10 is -51/140.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 10 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 84 × 5 = 420,
    3/84 = 3 × 5/84 × 5 = 15/420
  3. Likewise, for the 2nd fraction, since 10 × 42 = 420,
    4/10 = 4 × 42/10 × 42 = 168/420
  4. Subtract the two like fractions:
    15/420 - 168/420 = 15 - 168/420 = -153/420
  5. After reducing the fraction, the answer is -51/140

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