Answers

Add 20/63 and 60/80

20/63 + 60/80 is 269/252.

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,
   20/63 = 20 × 80/63 × 80 = 1600/5040
3. Likewise, for the 2nd fraction, since 80 × 63 = 5040,
   60/80 = 60 × 63/80 × 63 = 3780/5040
4. Add the two like fractions:
   1600/5040 + 3780/5040 = 1600 + 3780/5040 = 5380/5040
5. 5380/5040 simplified gives 269/252
6. So, 20/63 + 60/80 = 269/252
   In mixed form: 117/252

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