Answers

Add 90/45 and 12/80

1^st number: 2 0/45, 2^nd number: 12/80

90/45 + 12/80 is 43/20.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 45 and 80 is 720
   
   Next, find the equivalent fraction of both fractional numbers with denominator 720
2. For the 1st fraction, since 45 × 16 = 720,
   90/45 = 90 × 16/45 × 16 = 1440/720
3. Likewise, for the 2nd fraction, since 80 × 9 = 720,
   12/80 = 12 × 9/80 × 9 = 108/720
4. Add the two like fractions:
   1440/720 + 108/720 = 1440 + 108/720 = 1548/720
5. 1548/720 simplified gives 43/20
6. So, 90/45 + 12/80 = 43/20
   In mixed form: 23/20

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