Answers

Add 72/54 and 28/21

1^st number: 1 18/54, 2^nd number: 1 7/21

72/54 + 28/21 is 8/3.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 54 and 21 is 378
   
   Next, find the equivalent fraction of both fractional numbers with denominator 378
2. For the 1st fraction, since 54 × 7 = 378,
   72/54 = 72 × 7/54 × 7 = 504/378
3. Likewise, for the 2nd fraction, since 21 × 18 = 378,
   28/21 = 28 × 18/21 × 18 = 504/378
4. Add the two like fractions:
   504/378 + 504/378 = 504 + 504/378 = 1008/378
5. 1008/378 simplified gives 8/3
6. So, 72/54 + 28/21 = 8/3
   In mixed form: 22/3

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