Answers

Add 12/63 and 12/21

12/63 + 12/21 is 16/21.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 21 is 63
   
   Next, find the equivalent fraction of both fractional numbers with denominator 63
2. For the 1st fraction, since 63 × 1 = 63,
   12/63 = 12 × 1/63 × 1 = 12/63
3. Likewise, for the 2nd fraction, since 21 × 3 = 63,
   12/21 = 12 × 3/21 × 3 = 36/63
4. Add the two like fractions:
   12/63 + 36/63 = 12 + 36/63 = 48/63
5. 48/63 simplified gives 16/21
6. So, 12/63 + 12/21 = 16/21

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