Answers

Add 72/21 and 54/6

1^st number: 3 9/21, 2^nd number: 9 0/6

72/21 + 54/6 is 87/7.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 6 is 42
   
   Next, find the equivalent fraction of both fractional numbers with denominator 42
2. For the 1st fraction, since 21 × 2 = 42,
   72/21 = 72 × 2/21 × 2 = 144/42
3. Likewise, for the 2nd fraction, since 6 × 7 = 42,
   54/6 = 54 × 7/6 × 7 = 378/42
4. Add the two like fractions:
   144/42 + 378/42 = 144 + 378/42 = 522/42
5. 522/42 simplified gives 87/7
6. So, 72/21 + 54/6 = 87/7
   In mixed form: 123/7

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