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Add 15/16 and 40/42

15/16 + 40/42 is 635/336.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 16 and 42 is 336

    Next, find the equivalent fraction of both fractional numbers with denominator 336
  2. For the 1st fraction, since 16 × 21 = 336,
    15/16 = 15 × 21/16 × 21 = 315/336
  3. Likewise, for the 2nd fraction, since 42 × 8 = 336,
    40/42 = 40 × 8/42 × 8 = 320/336
  4. Add the two like fractions:
    315/336 + 320/336 = 315 + 320/336 = 635/336
  5. So, 15/16 + 40/42 = 635/336
    In mixed form: 1299/336

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