Answers

Add 84/63 and 48/20

1^st number: 1 21/63, 2^nd number: 2 8/20

84/63 + 48/20 is 56/15.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 20 is 1260
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1260
2. For the 1st fraction, since 63 × 20 = 1260,
   84/63 = 84 × 20/63 × 20 = 1680/1260
3. Likewise, for the 2nd fraction, since 20 × 63 = 1260,
   48/20 = 48 × 63/20 × 63 = 3024/1260
4. Add the two like fractions:
   1680/1260 + 3024/1260 = 1680 + 3024/1260 = 4704/1260
5. 4704/1260 simplified gives 56/15
6. So, 84/63 + 48/20 = 56/15
   In mixed form: 311/15

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