Answers

Add 72/63 and 21/60

1^st number: 1 9/63, 2^nd number: 21/60

72/63 + 21/60 is 209/140.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 60 is 1260
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1260
2. For the 1st fraction, since 63 × 20 = 1260,
   72/63 = 72 × 20/63 × 20 = 1440/1260
3. Likewise, for the 2nd fraction, since 60 × 21 = 1260,
   21/60 = 21 × 21/60 × 21 = 441/1260
4. Add the two like fractions:
   1440/1260 + 441/1260 = 1440 + 441/1260 = 1881/1260
5. 1881/1260 simplified gives 209/140
6. So, 72/63 + 21/60 = 209/140
   In mixed form: 169/140

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