Answers

Add 25/42 and 15/54

25/42 + 15/54 is 55/63.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 54 is 378
   
   Next, find the equivalent fraction of both fractional numbers with denominator 378
2. For the 1st fraction, since 42 × 9 = 378,
   25/42 = 25 × 9/42 × 9 = 225/378
3. Likewise, for the 2nd fraction, since 54 × 7 = 378,
   15/54 = 15 × 7/54 × 7 = 105/378
4. Add the two like fractions:
   225/378 + 105/378 = 225 + 105/378 = 330/378
5. 330/378 simplified gives 55/63
6. So, 25/42 + 15/54 = 55/63

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