Answers

Add 72/18 and 63/21

1^st number: 4 0/18, 2^nd number: 3 0/21

72/18 + 63/21 is 7/1.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 18 and 21 is 126
   
   Next, find the equivalent fraction of both fractional numbers with denominator 126
2. For the 1st fraction, since 18 × 7 = 126,
   72/18 = 72 × 7/18 × 7 = 504/126
3. Likewise, for the 2nd fraction, since 21 × 6 = 126,
   63/21 = 63 × 6/21 × 6 = 378/126
4. Add the two like fractions:
   504/126 + 378/126 = 504 + 378/126 = 882/126
5. 882/126 simplified gives 7/1
6. So, 72/18 + 63/21 = 7/1

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