Answers

Add 25/20 and 21/63

1^st number: 1 5/20, 2^nd number: 21/63

25/20 + 21/63 is 19/12.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 63 is 1260
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1260
2. For the 1st fraction, since 20 × 63 = 1260,
   25/20 = 25 × 63/20 × 63 = 1575/1260
3. Likewise, for the 2nd fraction, since 63 × 20 = 1260,
   21/63 = 21 × 20/63 × 20 = 420/1260
4. Add the two like fractions:
   1575/1260 + 420/1260 = 1575 + 420/1260 = 1995/1260
5. 1995/1260 simplified gives 19/12
6. So, 25/20 + 21/63 = 19/12
   In mixed form: 17/12

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