Answers

Add 20/81 and 7/72

20/81 + 7/72 is 223/648.

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,
   20/81 = 20 × 8/81 × 8 = 160/648
3. Likewise, for the 2nd fraction, since 72 × 9 = 648,
   7/72 = 7 × 9/72 × 9 = 63/648
4. Add the two like fractions:
   160/648 + 63/648 = 160 + 63/648 = 223/648
5. So, 20/81 + 7/72 = 223/648

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