Answers

Add 12/4 and 54/90

1^st number: 3 0/4, 2^nd number: 54/90

12/4 + 54/90 is 18/5.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 4 and 90 is 180
   
   Next, find the equivalent fraction of both fractional numbers with denominator 180
2. For the 1st fraction, since 4 × 45 = 180,
   12/4 = 12 × 45/4 × 45 = 540/180
3. Likewise, for the 2nd fraction, since 90 × 2 = 180,
   54/90 = 54 × 2/90 × 2 = 108/180
4. Add the two like fractions:
   540/180 + 108/180 = 540 + 108/180 = 648/180
5. 648/180 simplified gives 18/5
6. So, 12/4 + 54/90 = 18/5
   In mixed form: 33/5

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