Answers

Add 21/12 and 63/28

1^st number: 1 9/12, 2^nd number: 2 7/28

21/12 + 63/28 is 4/1.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 12 and 28 is 84
   
   Next, find the equivalent fraction of both fractional numbers with denominator 84
2. For the 1st fraction, since 12 × 7 = 84,
   21/12 = 21 × 7/12 × 7 = 147/84
3. Likewise, for the 2nd fraction, since 28 × 3 = 84,
   63/28 = 63 × 3/28 × 3 = 189/84
4. Add the two like fractions:
   147/84 + 189/84 = 147 + 189/84 = 336/84
5. 336/84 simplified gives 4/1
6. So, 21/12 + 63/28 = 4/1

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