Answers

Add 21/63 and 6/28

21/63 + 6/28 is 23/42.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 28 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 28 × 9 = 252,
   6/28 = 6 × 9/28 × 9 = 54/252
4. Add the two like fractions:
   84/252 + 54/252 = 84 + 54/252 = 138/252
5. 138/252 simplified gives 23/42
6. So, 21/63 + 6/28 = 23/42

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