2 and 7
2+7=9
3,3, and 3
3+3+3=9
1,2,3, and 3
1+2+3+3= 9
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If they have to be different, none (because 1 is not prime). If they can be similar, the only combination is 3 + 3 + 3.
You may mean: 3 and 5 are prime numbers that add up to the composite number of 8
19,29,59,79,89 are the prime numbers with 9 in its Unit place.
No even numbers add up to 9. The sum of even numbers is always an even number.
If the two numbers are relatively prime, their least common multiple is their product. The prime factors of 99 are 3, 3, and 11. Since the two numbers are relatively prime, the possibilities are 9 and 11 or 1 and 99. The pair of 9 and 11 add up to 20 and their least common multiple is 99. So, 9 and 11 are the two numbers.