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Add 15/20 and 81/28

1st number: 15/20, 2nd number: 2 25/28

15/20 + 81/28 is 51/14.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 28 is 140
  2. For the 1st fraction, since 20 × 7 = 140,
    15/20 = 15 × 7/20 × 7 = 105/140
  3. Likewise, for the 2nd fraction, since 28 × 5 = 140,
    81/28 = 81 × 5/28 × 5 = 405/140
  4. Add the two fractions:
    105/140 + 405/140 = 105 + 405/140 = 510/140
  5. 510/140 simplified gives 51/14
  6. So, 15/20 + 81/28 = 51/14
    In mixed form: 39/14

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