Answers

Add 50/81 and 20/72

50/81 + 20/72 is 145/162.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 72 is 648
   
   Next, find the equivalent fraction of both fractional numbers with denominator 648
2. For the 1st fraction, since 81 × 8 = 648,
   50/81 = 50 × 8/81 × 8 = 400/648
3. Likewise, for the 2nd fraction, since 72 × 9 = 648,
   20/72 = 20 × 9/72 × 9 = 180/648
4. Add the two like fractions:
   400/648 + 180/648 = 400 + 180/648 = 580/648
5. 580/648 simplified gives 145/162
6. So, 50/81 + 20/72 = 145/162

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