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Add 21/15 and 90/27

1st number: 1 6/15, 2nd number: 3 9/27

21/15 + 90/27 is 71/15.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 27 is 135
  2. For the 1st fraction, since 15 × 9 = 135,
    21/15 = 21 × 9/15 × 9 = 189/135
  3. Likewise, for the 2nd fraction, since 27 × 5 = 135,
    90/27 = 90 × 5/27 × 5 = 450/135
  4. Add the two fractions:
    189/135 + 450/135 = 189 + 450/135 = 639/135
  5. After reducing the fraction, the answer is 71/15
  6. In mixed form: 411/15

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