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Add 81/90 and 15/42

81/90 + 15/42 is 44/35.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 42 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 90 × 7 = 630,
    81/90 = 81 × 7/90 × 7 = 567/630
  3. Likewise, for the 2nd fraction, since 42 × 15 = 630,
    15/42 = 15 × 15/42 × 15 = 225/630
  4. Add the two like fractions:
    567/630 + 225/630 = 567 + 225/630 = 792/630
  5. 792/630 simplified gives 44/35
  6. So, 81/90 + 15/42 = 44/35
    In mixed form: 19/35

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