Answers

Add 18/63 and 10/15

18/63 + 10/15 is 20/21.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 15 is 315
   
   Next, find the equivalent fraction of both fractional numbers with denominator 315
2. For the 1st fraction, since 63 × 5 = 315,
   18/63 = 18 × 5/63 × 5 = 90/315
3. Likewise, for the 2nd fraction, since 15 × 21 = 315,
   10/15 = 10 × 21/15 × 21 = 210/315
4. Add the two like fractions:
   90/315 + 210/315 = 90 + 210/315 = 300/315
5. 300/315 simplified gives 20/21
6. So, 18/63 + 10/15 = 20/21

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