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Add 21/15 and 12/18

1st number: 1 6/15, 2nd number: 12/18

21/15 + 12/18 is 31/15.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 18 is 90
  2. For the 1st fraction, since 15 × 6 = 90,
    21/15 = 21 × 6/15 × 6 = 126/90
  3. Likewise, for the 2nd fraction, since 18 × 5 = 90,
    12/18 = 12 × 5/18 × 5 = 60/90
  4. Add the two fractions:
    126/90 + 60/90 = 126 + 60/90 = 186/90
  5. 186/90 simplified gives 31/15
  6. So, 21/15 + 12/18 = 31/15
    In mixed form: 21/15

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