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Add 70/80 and 12/90

70/80 + 12/90 is 121/120.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 720
  2. For the 1st fraction, since 80 × 9 = 720,
    70/80 = 70 × 9/80 × 9 = 630/720
  3. Likewise, for the 2nd fraction, since 90 × 8 = 720,
    12/90 = 12 × 8/90 × 8 = 96/720
  4. Add the two like fractions:
    630/720 + 96/720 = 630 + 96/720 = 726/720
  5. 726/720 simplified gives 121/120
  6. So, 70/80 + 12/90 = 121/120
    In mixed form: 11/120

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