What two numbers add up to 8423?

There are infinite combinations of two numbers that add up to 8423. Here are some examples using negative numbers:

-1 + 8424 = 8423
-2 + 8425 = 8423
-3 + 8426 = 8423
...

Here are some examples using two fractions that will add up to 8423:

8423/2 + 8423/2 = 8423
16846/3 + 8423/3 = 8423
25269/4 + 8423/4 = 8423
...

And here are some examples using two decimal numbers that will add up to 8423:

1.25 + 8421.75 = 8423
2.50 + 8420.5 = 8423
3.75 + 8419.25 = 8423
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 8423?", 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 8423. (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 8423?" has 4211 answers:

1 + 8422 = 8423
2 + 8421 = 8423
3 + 8420 = 8423
.
.
4209 + 4214 = 8423
4210 + 4213 = 8423
4211 + 4212 = 8423

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 8423 by 2 and then rounded down to the nearest whole number if necessary.

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