Answers

Add 12/21 and 60/81

12/21 + 60/81 is 248/189.

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,
   12/21 = 12 × 27/21 × 27 = 324/567
3. Likewise, for the 2nd fraction, since 81 × 7 = 567,
   60/81 = 60 × 7/81 × 7 = 420/567
4. Add the two like fractions:
   324/567 + 420/567 = 324 + 420/567 = 744/567
5. 744/567 simplified gives 248/189
6. So, 12/21 + 60/81 = 248/189
   In mixed form: 159/189

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