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Add 21/4 and 9/15

1st number: 5 1/4, 2nd number: 9/15

21/4 + 9/15 is 117/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 4 and 15 is 60
  2. For the 1st fraction, since 4 × 15 = 60,
    21/4 = 21 × 15/4 × 15 = 315/60
  3. Likewise, for the 2nd fraction, since 15 × 4 = 60,
    9/15 = 9 × 4/15 × 4 = 36/60
  4. Add the two fractions:
    315/60 + 36/60 = 315 + 36/60 = 351/60
  5. After reducing the fraction, the answer is 117/20
  6. In mixed form: 517/20

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