Answers

Add 42/49 and 81/20

1^st number: 42/49, 2^nd number: 4 1/20

42/49 + 81/20 is 687/140.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 49 and 20 is 980
   
   Next, find the equivalent fraction of both fractional numbers with denominator 980
2. For the 1st fraction, since 49 × 20 = 980,
   42/49 = 42 × 20/49 × 20 = 840/980
3. Likewise, for the 2nd fraction, since 20 × 49 = 980,
   81/20 = 81 × 49/20 × 49 = 3969/980
4. Add the two like fractions:
   840/980 + 3969/980 = 840 + 3969/980 = 4809/980
5. 4809/980 simplified gives 687/140
6. So, 42/49 + 81/20 = 687/140
   In mixed form: 4127/140

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