Answers

Add 63/84 and 21/45

63/84 + 21/45 is 73/60.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 45 is 1260
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1260
2. For the 1st fraction, since 84 × 15 = 1260,
   63/84 = 63 × 15/84 × 15 = 945/1260
3. Likewise, for the 2nd fraction, since 45 × 28 = 1260,
   21/45 = 21 × 28/45 × 28 = 588/1260
4. Add the two like fractions:
   945/1260 + 588/1260 = 945 + 588/1260 = 1533/1260
5. 1533/1260 simplified gives 73/60
6. So, 63/84 + 21/45 = 73/60
   In mixed form: 113/60

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