What two numbers add up to 905?

There are infinite combinations of two numbers that add up to 905. Here are some examples using negative numbers:

-1 + 906 = 905
-2 + 907 = 905
-3 + 908 = 905
...

Here are some examples using two fractions that will add up to 905:

905/2 + 905/2 = 905
1810/3 + 905/3 = 905
2715/4 + 905/4 = 905
...

And here are some examples using two decimal numbers that will add up to 905:

1.25 + 903.75 = 905
2.50 + 902.5 = 905
3.75 + 901.25 = 905
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 905?", it may be more interesting to set some criteria to limit the result. We will set the follow criteria:

1) Only positive whole numbers can add up to 905. (0 is not a positive or negative number and should not be included.)

2) Since a+b=29 is the same as b+a=29, we should only list it once.

Now, the answer to "What two numbers add up to 905?" has 452 answers:

1 + 904 = 905
2 + 903 = 905
3 + 902 = 905
.
.
450 + 455 = 905
451 + 454 = 905
452 + 453 = 905

We have truncated the list above due to space, but you may be interested to know that we calculated the number of answers by dividing 905 by 2 and then rounded down to the nearest whole number if necessary.

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What two numbers add up to 906?
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