Answers

Add 42/81 and 7/5

1^st number: 42/81, 2^nd number: 1 2/5

42/81 + 7/5 is 259/135.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 5 is 405
   
   Next, find the equivalent fraction of both fractional numbers with denominator 405
2. For the 1st fraction, since 81 × 5 = 405,
   42/81 = 42 × 5/81 × 5 = 210/405
3. Likewise, for the 2nd fraction, since 5 × 81 = 405,
   7/5 = 7 × 81/5 × 81 = 567/405
4. Add the two like fractions:
   210/405 + 567/405 = 210 + 567/405 = 777/405
5. 777/405 simplified gives 259/135
6. So, 42/81 + 7/5 = 259/135
   In mixed form: 1124/135

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