What two numbers add up to 9978?

There are infinite combinations of two numbers that add up to 9978. Here are some examples using negative numbers:

-1 + 9979 = 9978
-2 + 9980 = 9978
-3 + 9981 = 9978
...

Here are some examples using two fractions that will add up to 9978:

9978/2 + 9978/2 = 9978
19956/3 + 9978/3 = 9978
29934/4 + 9978/4 = 9978
...

And here are some examples using two decimal numbers that will add up to 9978:

1.25 + 9976.75 = 9978
2.50 + 9975.5 = 9978
3.75 + 9974.25 = 9978
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 9978?", 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 9978. (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 9978?" has 4989 answers:

1 + 9977 = 9978
2 + 9976 = 9978
3 + 9975 = 9978
.
.
4987 + 4991 = 9978
4988 + 4990 = 9978
4989 + 4989 = 9978

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 9978 by 2 and then rounded down to the nearest whole number if necessary.

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