What two numbers add up to 637?

There are infinite combinations of two numbers that add up to 637. Here are some examples using negative numbers:

-1 + 638 = 637
-2 + 639 = 637
-3 + 640 = 637
...

Here are some examples using two fractions that will add up to 637:

637/2 + 637/2 = 637
1274/3 + 637/3 = 637
1911/4 + 637/4 = 637
...

And here are some examples using two decimal numbers that will add up to 637:

1.25 + 635.75 = 637
2.50 + 634.5 = 637
3.75 + 633.25 = 637
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 637?", 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 637. (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 637?" has 318 answers:

1 + 636 = 637
2 + 635 = 637
3 + 634 = 637
.
.
316 + 321 = 637
317 + 320 = 637
318 + 319 = 637

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

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