Answers

Add 63/42 and 45/20

1^st number: 1 21/42, 2^nd number: 2 5/20

63/42 + 45/20 is 15/4.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 20 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 42 × 10 = 420,
   63/42 = 63 × 10/42 × 10 = 630/420
3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
   45/20 = 45 × 21/20 × 21 = 945/420
4. Add the two like fractions:
   630/420 + 945/420 = 630 + 945/420 = 1575/420
5. 1575/420 simplified gives 15/4
6. So, 63/42 + 45/20 = 15/4
   In mixed form: 33/4

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