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Subtract 3/81 from 21/70

21/70 - 3/81 is 71/270.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 81 is 5670

    Next, find the equivalent fraction of both fractional numbers with denominator 5670
  2. For the 1st fraction, since 70 × 81 = 5670,
    21/70 = 21 × 81/70 × 81 = 1701/5670
  3. Likewise, for the 2nd fraction, since 81 × 70 = 5670,
    3/81 = 3 × 70/81 × 70 = 210/5670
  4. Subtract the two like fractions:
    1701/5670 - 210/5670 = 1701 - 210/5670 = 1491/5670
  5. After reducing the fraction, the answer is 71/270

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