Answers

Add 90/28 and 15/80

1^st number: 3 6/28, 2^nd number: 15/80

90/28 + 15/80 is 381/112.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 28 and 80 is 560
   
   Next, find the equivalent fraction of both fractional numbers with denominator 560
2. For the 1st fraction, since 28 × 20 = 560,
   90/28 = 90 × 20/28 × 20 = 1800/560
3. Likewise, for the 2nd fraction, since 80 × 7 = 560,
   15/80 = 15 × 7/80 × 7 = 105/560
4. Add the two like fractions:
   1800/560 + 105/560 = 1800 + 105/560 = 1905/560
5. 1905/560 simplified gives 381/112
6. So, 90/28 + 15/80 = 381/112
   In mixed form: 345/112

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