Answers

Add 7/21 and 5/81

7/21 + 5/81 is 32/81.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 81 is 567
   
   Next, find the equivalent fraction of both fractional numbers with denominator 567
2. For the 1st fraction, since 21 × 27 = 567,
   7/21 = 7 × 27/21 × 27 = 189/567
3. Likewise, for the 2nd fraction, since 81 × 7 = 567,
   5/81 = 5 × 7/81 × 7 = 35/567
4. Add the two like fractions:
   189/567 + 35/567 = 189 + 35/567 = 224/567
5. 224/567 simplified gives 32/81
6. So, 7/21 + 5/81 = 32/81

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