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Add 21/15 and 90/81

1st number: 1 6/15, 2nd number: 1 9/81

21/15 + 90/81 is 113/45.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 81 is 405
  2. For the 1st fraction, since 15 × 27 = 405,
    21/15 = 21 × 27/15 × 27 = 567/405
  3. Likewise, for the 2nd fraction, since 81 × 5 = 405,
    90/81 = 90 × 5/81 × 5 = 450/405
  4. Add the two fractions:
    567/405 + 450/405 = 567 + 450/405 = 1017/405
  5. After reducing the fraction, the answer is 113/45
  6. In mixed form: 223/45

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