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Add 18/15 and 21/9

1st number: 1 3/15, 2nd number: 2 3/9

18/15 + 21/9 is 53/15.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 9 is 45

    Next, find the equivalent fraction of both fractional numbers with denominator 45
  2. For the 1st fraction, since 15 × 3 = 45,
    18/15 = 18 × 3/15 × 3 = 54/45
  3. Likewise, for the 2nd fraction, since 9 × 5 = 45,
    21/9 = 21 × 5/9 × 5 = 105/45
  4. Add the two like fractions:
    54/45 + 105/45 = 54 + 105/45 = 159/45
  5. 159/45 simplified gives 53/15
  6. So, 18/15 + 21/9 = 53/15
    In mixed form: 38/15

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