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Subtract 10/40 from 3/21

3/21 - 10/40 is -3/28.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 40 is 840

    Next, find the equivalent fraction of both fractional numbers with denominator 840
  2. For the 1st fraction, since 21 × 40 = 840,
    3/21 = 3 × 40/21 × 40 = 120/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    10/40 = 10 × 21/40 × 21 = 210/840
  4. Subtract the two like fractions:
    120/840 - 210/840 = 120 - 210/840 = -90/840
  5. After reducing the fraction, the answer is -3/28

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