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Subtract 10/9 from 70/81

1st number: 70/81, 2nd number: 1 1/9

70/81 - 10/9 is -20/81.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 81 and 9 is 81

    Next, find the equivalent fraction of both fractional numbers with denominator 81
  2. For the 1st fraction, since 81 × 1 = 81,
    70/81 = 70 × 1/81 × 1 = 70/81
  3. Likewise, for the 2nd fraction, since 9 × 9 = 81,
    10/9 = 10 × 9/9 × 9 = 90/81
  4. Subtract the two like fractions:
    70/81 - 90/81 = 70 - 90/81 = -20/81

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