Answers

Add 63/12 and 64/21

1^st number: 5 3/12, 2^nd number: 3 1/21

63/12 + 64/21 is 697/84.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 12 and 21 is 84
   
   Next, find the equivalent fraction of both fractional numbers with denominator 84
2. For the 1st fraction, since 12 × 7 = 84,
   63/12 = 63 × 7/12 × 7 = 441/84
3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
   64/21 = 64 × 4/21 × 4 = 256/84
4. Add the two like fractions:
   441/84 + 256/84 = 441 + 256/84 = 697/84
5. So, 63/12 + 64/21 = 697/84
   In mixed form: 825/84

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