Answers

Add 84/21 and 18/12

1^st number: 4 0/21, 2^nd number: 1 6/12

84/21 + 18/12 is 11/2.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 12 is 84
   
   Next, find the equivalent fraction of both fractional numbers with denominator 84
2. For the 1st fraction, since 21 × 4 = 84,
   84/21 = 84 × 4/21 × 4 = 336/84
3. Likewise, for the 2nd fraction, since 12 × 7 = 84,
   18/12 = 18 × 7/12 × 7 = 126/84
4. Add the two like fractions:
   336/84 + 126/84 = 336 + 126/84 = 462/84
5. 462/84 simplified gives 11/2
6. So, 84/21 + 18/12 = 11/2
   In mixed form: 51/2

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