Answers

Add 21/63 and 2/12

21/63 + 2/12 is 1/2.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 12 is 252
   
   Next, find the equivalent fraction of both fractional numbers with denominator 252
2. For the 1st fraction, since 63 × 4 = 252,
   21/63 = 21 × 4/63 × 4 = 84/252
3. Likewise, for the 2nd fraction, since 12 × 21 = 252,
   2/12 = 2 × 21/12 × 21 = 42/252
4. Add the two like fractions:
   84/252 + 42/252 = 84 + 42/252 = 126/252
5. 126/252 simplified gives 1/2
6. So, 21/63 + 2/12 = 1/2

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