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Add 21/42 and 27/15

1st number: 21/42, 2nd number: 1 12/15

21/42 + 27/15 is 23/10.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 15 is 210
  2. For the 1st fraction, since 42 × 5 = 210,
    21/42 = 21 × 5/42 × 5 = 105/210
  3. Likewise, for the 2nd fraction, since 15 × 14 = 210,
    27/15 = 27 × 14/15 × 14 = 378/210
  4. Add the two fractions:
    105/210 + 378/210 = 105 + 378/210 = 483/210
  5. After reducing the fraction, the answer is 23/10
  6. In mixed form: 23/10

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