What two numbers add up to 8400?

There are infinite combinations of two numbers that add up to 8400. Here are some examples using negative numbers:

-1 + 8401 = 8400
-2 + 8402 = 8400
-3 + 8403 = 8400
...

Here are some examples using two fractions that will add up to 8400:

8400/2 + 8400/2 = 8400
16800/3 + 8400/3 = 8400
25200/4 + 8400/4 = 8400
...

And here are some examples using two decimal numbers that will add up to 8400:

1.25 + 8398.75 = 8400
2.50 + 8397.5 = 8400
3.75 + 8396.25 = 8400
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 8400?", 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 8400. (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 8400?" has 4200 answers:

1 + 8399 = 8400
2 + 8398 = 8400
3 + 8397 = 8400
.
.
4198 + 4202 = 8400
4199 + 4201 = 8400
4200 + 4200 = 8400

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 8400 by 2 and then rounded down to the nearest whole number if necessary.

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