Answers

Add 81/63 and 75/20

1^st number: 1 18/63, 2^nd number: 3 15/20

81/63 + 75/20 is 141/28.

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,
   81/63 = 81 × 20/63 × 20 = 1620/1260
3. Likewise, for the 2nd fraction, since 20 × 63 = 1260,
   75/20 = 75 × 63/20 × 63 = 4725/1260
4. Add the two like fractions:
   1620/1260 + 4725/1260 = 1620 + 4725/1260 = 6345/1260
5. 6345/1260 simplified gives 141/28
6. So, 81/63 + 75/20 = 141/28
   In mixed form: 51/28

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