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Add 81/15 and 90/7

1st number: 5 6/15, 2nd number: 12 6/7

81/15 + 90/7 is 639/35.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 7 is 105

    Next, find the equivalent fraction of both fractional numbers with denominator 105
  2. For the 1st fraction, since 15 × 7 = 105,
    81/15 = 81 × 7/15 × 7 = 567/105
  3. Likewise, for the 2nd fraction, since 7 × 15 = 105,
    90/7 = 90 × 15/7 × 15 = 1350/105
  4. Add the two like fractions:
    567/105 + 1350/105 = 567 + 1350/105 = 1917/105
  5. 1917/105 simplified gives 639/35
  6. So, 81/15 + 90/7 = 639/35
    In mixed form: 189/35

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