Answers

Add 72/63 and 84/20

1^st number: 1 9/63, 2^nd number: 4 4/20

72/63 + 84/20 is 187/35.

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,
   72/63 = 72 × 20/63 × 20 = 1440/1260
3. Likewise, for the 2nd fraction, since 20 × 63 = 1260,
   84/20 = 84 × 63/20 × 63 = 5292/1260
4. Add the two like fractions:
   1440/1260 + 5292/1260 = 1440 + 5292/1260 = 6732/1260
5. 6732/1260 simplified gives 187/35
6. So, 72/63 + 84/20 = 187/35
   In mixed form: 512/35

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