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Add 81/90 and 70/80

81/90 + 70/80 is 71/40.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 80 is 720

    Next, find the equivalent fraction of both fractional numbers with denominator 720
  2. For the 1st fraction, since 90 × 8 = 720,
    81/90 = 81 × 8/90 × 8 = 648/720
  3. Likewise, for the 2nd fraction, since 80 × 9 = 720,
    70/80 = 70 × 9/80 × 9 = 630/720
  4. Add the two like fractions:
    648/720 + 630/720 = 648 + 630/720 = 1278/720
  5. 1278/720 simplified gives 71/40
  6. So, 81/90 + 70/80 = 71/40
    In mixed form: 131/40

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