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Add 21/15 and 28/18

1st number: 1 6/15, 2nd number: 1 10/18

21/15 + 28/18 is 133/45.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 18 is 90
  2. For the 1st fraction, since 15 × 6 = 90,
    21/15 = 21 × 6/15 × 6 = 126/90
  3. Likewise, for the 2nd fraction, since 18 × 5 = 90,
    28/18 = 28 × 5/18 × 5 = 140/90
  4. Add the two fractions:
    126/90 + 140/90 = 126 + 140/90 = 266/90
  5. 266/90 simplified gives 133/45
  6. So, 21/15 + 28/18 = 133/45
    In mixed form: 243/45

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