Answers

Add 90/40 and 12/80

1^st number: 2 10/40, 2^nd number: 12/80

90/40 + 12/80 is 12/5.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 40 and 80 is 80
   
   Next, find the equivalent fraction of both fractional numbers with denominator 80
2. For the 1st fraction, since 40 × 2 = 80,
   90/40 = 90 × 2/40 × 2 = 180/80
3. Likewise, for the 2nd fraction, since 80 × 1 = 80,
   12/80 = 12 × 1/80 × 1 = 12/80
4. Add the two like fractions:
   180/80 + 12/80 = 180 + 12/80 = 192/80
5. 192/80 simplified gives 12/5
6. So, 90/40 + 12/80 = 12/5
   In mixed form: 22/5

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