There are infinitely many pairs.
Two examples are 55000 and 55000, or 100000 and 10000.
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The idea is to round each of the numbers - in this case to the nearest multiple of 10 - then do the addition in your head.
If two numbers have a sum of 31 and a product of 228, then the two numbers are 12 and 19. Adding them will give you 31, and multiplying them gives you 228.
The result is called the sum of the two numbers. The operation of addition is commutative. This means that the addition of two numbers will give the same sum regardless of the order in which the numbers are added.
11 and 12
1 + pi, 1 - pi. Their sum is 2.