Answers

Add 15/84 and 72/63

1^st number: 15/84, 2^nd number: 1 9/63

15/84 + 72/63 is 37/28.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 63 is 252
   
   Next, find the equivalent fraction of both fractional numbers with denominator 252
2. For the 1st fraction, since 84 × 3 = 252,
   15/84 = 15 × 3/84 × 3 = 45/252
3. Likewise, for the 2nd fraction, since 63 × 4 = 252,
   72/63 = 72 × 4/63 × 4 = 288/252
4. Add the two like fractions:
   45/252 + 288/252 = 45 + 288/252 = 333/252
5. 333/252 simplified gives 37/28
6. So, 15/84 + 72/63 = 37/28
   In mixed form: 19/28

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