Answers

Add 24/12 and 42/21

1^st number: 2 0/12, 2^nd number: 2 0/21

24/12 + 42/21 is 4/1.

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,
   24/12 = 24 × 7/12 × 7 = 168/84
3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
   42/21 = 42 × 4/21 × 4 = 168/84
4. Add the two like fractions:
   168/84 + 168/84 = 168 + 168/84 = 336/84
5. 336/84 simplified gives 4/1
6. So, 24/12 + 42/21 = 4/1

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