Answers

Add 80/18 and 90/27

1^st number: 4 8/18, 2^nd number: 3 9/27

80/18 + 90/27 is 70/9.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 18 and 27 is 54
   
   Next, find the equivalent fraction of both fractional numbers with denominator 54
2. For the 1st fraction, since 18 × 3 = 54,
   80/18 = 80 × 3/18 × 3 = 240/54
3. Likewise, for the 2nd fraction, since 27 × 2 = 54,
   90/27 = 90 × 2/27 × 2 = 180/54
4. Add the two like fractions:
   240/54 + 180/54 = 240 + 180/54 = 420/54
5. 420/54 simplified gives 70/9
6. So, 80/18 + 90/27 = 70/9
   In mixed form: 77/9

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