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Add 84/90 and 15/21

84/90 + 15/21 is 173/105.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 21 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 90 × 7 = 630,
    84/90 = 84 × 7/90 × 7 = 588/630
  3. Likewise, for the 2nd fraction, since 21 × 30 = 630,
    15/21 = 15 × 30/21 × 30 = 450/630
  4. Add the two like fractions:
    588/630 + 450/630 = 588 + 450/630 = 1038/630
  5. 1038/630 simplified gives 173/105
  6. So, 84/90 + 15/21 = 173/105
    In mixed form: 168/105

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