Answers

Add 75/21 and 12/54

1^st number: 3 12/21, 2^nd number: 12/54

75/21 + 12/54 is 239/63.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 54 is 378
   
   Next, find the equivalent fraction of both fractional numbers with denominator 378
2. For the 1st fraction, since 21 × 18 = 378,
   75/21 = 75 × 18/21 × 18 = 1350/378
3. Likewise, for the 2nd fraction, since 54 × 7 = 378,
   12/54 = 12 × 7/54 × 7 = 84/378
4. Add the two like fractions:
   1350/378 + 84/378 = 1350 + 84/378 = 1434/378
5. 1434/378 simplified gives 239/63
6. So, 75/21 + 12/54 = 239/63
   In mixed form: 350/63

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