Answers

Add 2/90 and 15/81

2/90 + 15/81 is 28/135.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 81 is 810
   
   Next, find the equivalent fraction of both fractional numbers with denominator 810
2. For the 1st fraction, since 90 × 9 = 810,
   2/90 = 2 × 9/90 × 9 = 18/810
3. Likewise, for the 2nd fraction, since 81 × 10 = 810,
   15/81 = 15 × 10/81 × 10 = 150/810
4. Add the two like fractions:
   18/810 + 150/810 = 18 + 150/810 = 168/810
5. 168/810 simplified gives 28/135
6. So, 2/90 + 15/81 = 28/135

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