What two numbers add up to 8990?

There are infinite combinations of two numbers that add up to 8990. Here are some examples using negative numbers:

-1 + 8991 = 8990
-2 + 8992 = 8990
-3 + 8993 = 8990
...

Here are some examples using two fractions that will add up to 8990:

8990/2 + 8990/2 = 8990
17980/3 + 8990/3 = 8990
26970/4 + 8990/4 = 8990
...

And here are some examples using two decimal numbers that will add up to 8990:

1.25 + 8988.75 = 8990
2.50 + 8987.5 = 8990
3.75 + 8986.25 = 8990
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 8990?", 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 8990. (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 8990?" has 4495 answers:

1 + 8989 = 8990
2 + 8988 = 8990
3 + 8987 = 8990
.
.
4493 + 4497 = 8990
4494 + 4496 = 8990
4495 + 4495 = 8990

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 8990 by 2 and then rounded down to the nearest whole number if necessary.

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