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Add 84/90 and 15/80

84/90 + 15/80 is 269/240.

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,
    84/90 = 84 × 8/90 × 8 = 672/720
  3. Likewise, for the 2nd fraction, since 80 × 9 = 720,
    15/80 = 15 × 9/80 × 9 = 135/720
  4. Add the two like fractions:
    672/720 + 135/720 = 672 + 135/720 = 807/720
  5. 807/720 simplified gives 269/240
  6. So, 84/90 + 15/80 = 269/240
    In mixed form: 129/240

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