Answers

Add 21/63 and 42/56

21/63 + 42/56 is 13/12.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 56 is 504
   
   Next, find the equivalent fraction of both fractional numbers with denominator 504
2. For the 1st fraction, since 63 × 8 = 504,
   21/63 = 21 × 8/63 × 8 = 168/504
3. Likewise, for the 2nd fraction, since 56 × 9 = 504,
   42/56 = 42 × 9/56 × 9 = 378/504
4. Add the two like fractions:
   168/504 + 378/504 = 168 + 378/504 = 546/504
5. 546/504 simplified gives 13/12
6. So, 21/63 + 42/56 = 13/12
   In mixed form: 11/12

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