Answers

Add 72/84 and 21/4

1^st number: 72/84, 2^nd number: 5 1/4

72/84 + 21/4 is 171/28.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 4 is 84
   
   Next, find the equivalent fraction of both fractional numbers with denominator 84
2. For the 1st fraction, since 84 × 1 = 84,
   72/84 = 72 × 1/84 × 1 = 72/84
3. Likewise, for the 2nd fraction, since 4 × 21 = 84,
   21/4 = 21 × 21/4 × 21 = 441/84
4. Add the two like fractions:
   72/84 + 441/84 = 72 + 441/84 = 513/84
5. 513/84 simplified gives 171/28
6. So, 72/84 + 21/4 = 171/28
   In mixed form: 63/28

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