Answers

Add 20/63 and 21/84

20/63 + 21/84 is 143/252.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 84 is 252
   
   Next, find the equivalent fraction of both fractional numbers with denominator 252
2. For the 1st fraction, since 63 × 4 = 252,
   20/63 = 20 × 4/63 × 4 = 80/252
3. Likewise, for the 2nd fraction, since 84 × 3 = 252,
   21/84 = 21 × 3/84 × 3 = 63/252
4. Add the two like fractions:
   80/252 + 63/252 = 80 + 63/252 = 143/252
5. So, 20/63 + 21/84 = 143/252

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