Answers

Add 90/28 and 20/81

1^st number: 3 6/28, 2^nd number: 20/81

90/28 + 20/81 is 3925/1134.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 28 and 81 is 2268
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2268
2. For the 1st fraction, since 28 × 81 = 2268,
   90/28 = 90 × 81/28 × 81 = 7290/2268
3. Likewise, for the 2nd fraction, since 81 × 28 = 2268,
   20/81 = 20 × 28/81 × 28 = 560/2268
4. Add the two like fractions:
   7290/2268 + 560/2268 = 7290 + 560/2268 = 7850/2268
5. 7850/2268 simplified gives 3925/1134
6. So, 90/28 + 20/81 = 3925/1134
   In mixed form: 3523/1134

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