Answers

Add 15/81 and 90/80

1^st number: 15/81, 2^nd number: 1 10/80

15/81 + 90/80 is 283/216.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 80 is 6480
   
   Next, find the equivalent fraction of both fractional numbers with denominator 6480
2. For the 1st fraction, since 81 × 80 = 6480,
   15/81 = 15 × 80/81 × 80 = 1200/6480
3. Likewise, for the 2nd fraction, since 80 × 81 = 6480,
   90/80 = 90 × 81/80 × 81 = 7290/6480
4. Add the two like fractions:
   1200/6480 + 7290/6480 = 1200 + 7290/6480 = 8490/6480
5. 8490/6480 simplified gives 283/216
6. So, 15/81 + 90/80 = 283/216
   In mixed form: 167/216

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