What two numbers add up to 399?

There are infinite combinations of two numbers that add up to 399. Here are some examples using negative numbers:

-1 + 400 = 399
-2 + 401 = 399
-3 + 402 = 399
...

Here are some examples using two fractions that will add up to 399:

399/2 + 399/2 = 399
798/3 + 399/3 = 399
1197/4 + 399/4 = 399
...

And here are some examples using two decimal numbers that will add up to 399:

1.25 + 397.75 = 399
2.50 + 396.5 = 399
3.75 + 395.25 = 399
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 399?", 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 399. (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 399?" has 199 answers:

1 + 398 = 399
2 + 397 = 399
3 + 396 = 399
.
.
197 + 202 = 399
198 + 201 = 399
199 + 200 = 399

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

Numbers That Add Up To Calculator
Submit another "What two numbers add up to x?" problem here.

What two numbers add up to 400?
Here is the next problem on our list that we answered and explained in a similar fashion.