Answers

Add 28/15 and 54/42

1^st number: 1 13/15, 2^nd number: 1 12/42

28/15 + 54/42 is 331/105.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 15 and 42 is 210
   
   Next, find the equivalent fraction of both fractional numbers with denominator 210
2. For the 1st fraction, since 15 × 14 = 210,
   28/15 = 28 × 14/15 × 14 = 392/210
3. Likewise, for the 2nd fraction, since 42 × 5 = 210,
   54/42 = 54 × 5/42 × 5 = 270/210
4. Add the two like fractions:
   392/210 + 270/210 = 392 + 270/210 = 662/210
5. 662/210 simplified gives 331/105
6. So, 28/15 + 54/42 = 331/105
   In mixed form: 316/105

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