Answers

Add 90/81 and 45/28

1^st number: 1 9/81, 2^nd number: 1 17/28

90/81 + 45/28 is 685/252.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 28 is 2268
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2268
2. For the 1st fraction, since 81 × 28 = 2268,
   90/81 = 90 × 28/81 × 28 = 2520/2268
3. Likewise, for the 2nd fraction, since 28 × 81 = 2268,
   45/28 = 45 × 81/28 × 81 = 3645/2268
4. Add the two like fractions:
   2520/2268 + 3645/2268 = 2520 + 3645/2268 = 6165/2268
5. 6165/2268 simplified gives 685/252
6. So, 90/81 + 45/28 = 685/252
   In mixed form: 2181/252

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