Answers

Add 63/21 and 36/80

1^st number: 3 0/21, 2^nd number: 36/80

63/21 + 36/80 is 69/20.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 80 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 21 × 80 = 1680,
   63/21 = 63 × 80/21 × 80 = 5040/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   36/80 = 36 × 21/80 × 21 = 756/1680
4. Add the two like fractions:
   5040/1680 + 756/1680 = 5040 + 756/1680 = 5796/1680
5. 5796/1680 simplified gives 69/20
6. So, 63/21 + 36/80 = 69/20
   In mixed form: 39/20

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