Answers

Add 12/54 and 45/42

1^st number: 12/54, 2^nd number: 1 3/42

12/54 + 45/42 is 163/126.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 54 and 42 is 378
   
   Next, find the equivalent fraction of both fractional numbers with denominator 378
2. For the 1st fraction, since 54 × 7 = 378,
   12/54 = 12 × 7/54 × 7 = 84/378
3. Likewise, for the 2nd fraction, since 42 × 9 = 378,
   45/42 = 45 × 9/42 × 9 = 405/378
4. Add the two like fractions:
   84/378 + 405/378 = 84 + 405/378 = 489/378
5. 489/378 simplified gives 163/126
6. So, 12/54 + 45/42 = 163/126
   In mixed form: 137/126

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