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Add 21/15 and 63/16

1st number: 1 6/15, 2nd number: 3 15/16

21/15 + 63/16 is 427/80.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 16 is 240

    Next, find the equivalent fraction of both fractional numbers with denominator 240
  2. For the 1st fraction, since 15 × 16 = 240,
    21/15 = 21 × 16/15 × 16 = 336/240
  3. Likewise, for the 2nd fraction, since 16 × 15 = 240,
    63/16 = 63 × 15/16 × 15 = 945/240
  4. Add the two like fractions:
    336/240 + 945/240 = 336 + 945/240 = 1281/240
  5. 1281/240 simplified gives 427/80
  6. So, 21/15 + 63/16 = 427/80
    In mixed form: 527/80

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