Answers

Add 72/21 and 18/81

1^st number: 3 9/21, 2^nd number: 18/81

72/21 + 18/81 is 230/63.

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,
   72/21 = 72 × 27/21 × 27 = 1944/567
3. Likewise, for the 2nd fraction, since 81 × 7 = 567,
   18/81 = 18 × 7/81 × 7 = 126/567
4. Add the two like fractions:
   1944/567 + 126/567 = 1944 + 126/567 = 2070/567
5. 2070/567 simplified gives 230/63
6. So, 72/21 + 18/81 = 230/63
   In mixed form: 341/63

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