Answers

Add 20/42 and 9/81

20/42 + 9/81 is 37/63.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 81 is 1134
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1134
2. For the 1st fraction, since 42 × 27 = 1134,
   20/42 = 20 × 27/42 × 27 = 540/1134
3. Likewise, for the 2nd fraction, since 81 × 14 = 1134,
   9/81 = 9 × 14/81 × 14 = 126/1134
4. Add the two like fractions:
   540/1134 + 126/1134 = 540 + 126/1134 = 666/1134
5. 666/1134 simplified gives 37/63
6. So, 20/42 + 9/81 = 37/63

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