Answers

Add 80/42 and 9/28

1^st number: 1 38/42, 2^nd number: 9/28

80/42 + 9/28 is 187/84.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 28 is 84
   
   Next, find the equivalent fraction of both fractional numbers with denominator 84
2. For the 1st fraction, since 42 × 2 = 84,
   80/42 = 80 × 2/42 × 2 = 160/84
3. Likewise, for the 2nd fraction, since 28 × 3 = 84,
   9/28 = 9 × 3/28 × 3 = 27/84
4. Add the two like fractions:
   160/84 + 27/84 = 160 + 27/84 = 187/84
5. So, 80/42 + 9/28 = 187/84
   In mixed form: 219/84

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