Answers

Add 80/15 and 90/28

1^st number: 5 5/15, 2^nd number: 3 6/28

80/15 + 90/28 is 359/42.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 15 and 28 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 15 × 28 = 420,
   80/15 = 80 × 28/15 × 28 = 2240/420
3. Likewise, for the 2nd fraction, since 28 × 15 = 420,
   90/28 = 90 × 15/28 × 15 = 1350/420
4. Add the two like fractions:
   2240/420 + 1350/420 = 2240 + 1350/420 = 3590/420
5. 3590/420 simplified gives 359/42
6. So, 80/15 + 90/28 = 359/42
   In mixed form: 823/42

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