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Add 20/15 and 21/4

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

20/15 + 21/4 is 79/12.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 4 is 60
  2. For the 1st fraction, since 15 × 4 = 60,
    20/15 = 20 × 4/15 × 4 = 80/60
  3. Likewise, for the 2nd fraction, since 4 × 15 = 60,
    21/4 = 21 × 15/4 × 15 = 315/60
  4. Add the two fractions:
    80/60 + 315/60 = 80 + 315/60 = 395/60
  5. After reducing the fraction, the answer is 79/12
  6. In mixed form: 67/12

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