Answers

Add 42/40 and 16/81

1^st number: 1 2/40, 2^nd number: 16/81

42/40 + 16/81 is 2021/1620.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 40 and 81 is 3240
   
   Next, find the equivalent fraction of both fractional numbers with denominator 3240
2. For the 1st fraction, since 40 × 81 = 3240,
   42/40 = 42 × 81/40 × 81 = 3402/3240
3. Likewise, for the 2nd fraction, since 81 × 40 = 3240,
   16/81 = 16 × 40/81 × 40 = 640/3240
4. Add the two like fractions:
   3402/3240 + 640/3240 = 3402 + 640/3240 = 4042/3240
5. 4042/3240 simplified gives 2021/1620
6. So, 42/40 + 16/81 = 2021/1620
   In mixed form: 1401/1620

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