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Add 21/15 and 90/9

1st number: 1 6/15, 2nd number: 10 0/9

21/15 + 90/9 is 57/5.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 9 is 45
  2. For the 1st fraction, since 15 × 3 = 45,
    21/15 = 21 × 3/15 × 3 = 63/45
  3. Likewise, for the 2nd fraction, since 9 × 5 = 45,
    90/9 = 90 × 5/9 × 5 = 450/45
  4. Add the two fractions:
    63/45 + 450/45 = 63 + 450/45 = 513/45
  5. After reducing the fraction, the answer is 57/5
  6. In mixed form: 112/5

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