Answers

Add 90/12 and 40/54

1^st number: 7 6/12, 2^nd number: 40/54

90/12 + 40/54 is 445/54.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 12 and 54 is 108
   
   Next, find the equivalent fraction of both fractional numbers with denominator 108
2. For the 1st fraction, since 12 × 9 = 108,
   90/12 = 90 × 9/12 × 9 = 810/108
3. Likewise, for the 2nd fraction, since 54 × 2 = 108,
   40/54 = 40 × 2/54 × 2 = 80/108
4. Add the two like fractions:
   810/108 + 80/108 = 810 + 80/108 = 890/108
5. 890/108 simplified gives 445/54
6. So, 90/12 + 40/54 = 445/54
   In mixed form: 813/54

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