Answers

Add 84/20 and 90/12

1^st number: 4 4/20, 2^nd number: 7 6/12

84/20 + 90/12 is 117/10.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 12 is 60
   
   Next, find the equivalent fraction of both fractional numbers with denominator 60
2. For the 1st fraction, since 20 × 3 = 60,
   84/20 = 84 × 3/20 × 3 = 252/60
3. Likewise, for the 2nd fraction, since 12 × 5 = 60,
   90/12 = 90 × 5/12 × 5 = 450/60
4. Add the two like fractions:
   252/60 + 450/60 = 252 + 450/60 = 702/60
5. 702/60 simplified gives 117/10
6. So, 84/20 + 90/12 = 117/10
   In mixed form: 117/10

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