Answers

Add 18/63 and 21/49

18/63 + 21/49 is 5/7.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 49 is 441
   
   Next, find the equivalent fraction of both fractional numbers with denominator 441
2. For the 1st fraction, since 63 × 7 = 441,
   18/63 = 18 × 7/63 × 7 = 126/441
3. Likewise, for the 2nd fraction, since 49 × 9 = 441,
   21/49 = 21 × 9/49 × 9 = 189/441
4. Add the two like fractions:
   126/441 + 189/441 = 126 + 189/441 = 315/441
5. 315/441 simplified gives 5/7
6. So, 18/63 + 21/49 = 5/7

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