Answers

Add 6/28 and 90/81

1^st number: 6/28, 2^nd number: 1 9/81

6/28 + 90/81 is 167/126.

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,
   6/28 = 6 × 81/28 × 81 = 486/2268
3. Likewise, for the 2nd fraction, since 81 × 28 = 2268,
   90/81 = 90 × 28/81 × 28 = 2520/2268
4. Add the two like fractions:
   486/2268 + 2520/2268 = 486 + 2520/2268 = 3006/2268
5. 3006/2268 simplified gives 167/126
6. So, 6/28 + 90/81 = 167/126
   In mixed form: 141/126

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