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Add 84/15 and 21/8

1st number: 5 9/15, 2nd number: 2 5/8

84/15 + 21/8 is 329/40.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 8 is 120

    Next, find the equivalent fraction of both fractional numbers with denominator 120
  2. For the 1st fraction, since 15 × 8 = 120,
    84/15 = 84 × 8/15 × 8 = 672/120
  3. Likewise, for the 2nd fraction, since 8 × 15 = 120,
    21/8 = 21 × 15/8 × 15 = 315/120
  4. Add the two like fractions:
    672/120 + 315/120 = 672 + 315/120 = 987/120
  5. 987/120 simplified gives 329/40
  6. So, 84/15 + 21/8 = 329/40
    In mixed form: 89/40

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