Answers

Add 90/28 and 15/90

1^st number: 3 6/28, 2^nd number: 15/90

90/28 + 15/90 is 71/21.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 28 and 90 is 1260
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1260
2. For the 1st fraction, since 28 × 45 = 1260,
   90/28 = 90 × 45/28 × 45 = 4050/1260
3. Likewise, for the 2nd fraction, since 90 × 14 = 1260,
   15/90 = 15 × 14/90 × 14 = 210/1260
4. Add the two like fractions:
   4050/1260 + 210/1260 = 4050 + 210/1260 = 4260/1260
5. 4260/1260 simplified gives 71/21
6. So, 90/28 + 15/90 = 71/21
   In mixed form: 38/21

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