Answers

Add 3/63 and 21/80

3/63 + 21/80 is 521/1680.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 80 is 5040
   
   Next, find the equivalent fraction of both fractional numbers with denominator 5040
2. For the 1st fraction, since 63 × 80 = 5040,
   3/63 = 3 × 80/63 × 80 = 240/5040
3. Likewise, for the 2nd fraction, since 80 × 63 = 5040,
   21/80 = 21 × 63/80 × 63 = 1323/5040
4. Add the two like fractions:
   240/5040 + 1323/5040 = 240 + 1323/5040 = 1563/5040
5. 1563/5040 simplified gives 521/1680
6. So, 3/63 + 21/80 = 521/1680

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