Answers

Add 28/4 and 90/15

1^st number: 7 0/4, 2^nd number: 6 0/15

28/4 + 90/15 is 13/1.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 4 and 15 is 60
   
   Next, find the equivalent fraction of both fractional numbers with denominator 60
2. For the 1st fraction, since 4 × 15 = 60,
   28/4 = 28 × 15/4 × 15 = 420/60
3. Likewise, for the 2nd fraction, since 15 × 4 = 60,
   90/15 = 90 × 4/15 × 4 = 360/60
4. Add the two like fractions:
   420/60 + 360/60 = 420 + 360/60 = 780/60
5. 780/60 simplified gives 13/1
6. So, 28/4 + 90/15 = 13/1

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