Add two 3-digit numbers to get a 3-digit sum using each of the numbers 1 through 9 only once

To add two three digits number to form a three digit number, the 3 digit number to be added should be less than 500 because 500 + 500 gives 1000 which is a four digit number.

In this case, there are many possibilities of creating a three digit number from 2 three digit number.

Example:

462 + 395 = 857

200 + 350 = 550