Answers

Add 5/90 and 42/81

5/90 + 42/81 is 31/54.

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,
   5/90 = 5 × 9/90 × 9 = 45/810
3. Likewise, for the 2nd fraction, since 81 × 10 = 810,
   42/81 = 42 × 10/81 × 10 = 420/810
4. Add the two like fractions:
   45/810 + 420/810 = 45 + 420/810 = 465/810
5. 465/810 simplified gives 31/54
6. So, 5/90 + 42/81 = 31/54

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