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Add 21/15 and 20/9

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

21/15 + 20/9 is 163/45.

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,
    20/9 = 20 × 5/9 × 5 = 100/45
  4. Add the two fractions:
    63/45 + 100/45 = 63 + 100/45 = 163/45
  5. In mixed form: 328/45

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