What two numbers add up to 1988?

There are infinite combinations of two numbers that add up to 1988. Here are some examples using negative numbers:

-1 + 1989 = 1988
-2 + 1990 = 1988
-3 + 1991 = 1988
...

Here are some examples using two fractions that will add up to 1988:

1988/2 + 1988/2 = 1988
3976/3 + 1988/3 = 1988
5964/4 + 1988/4 = 1988
...

And here are some examples using two decimal numbers that will add up to 1988:

1.25 + 1986.75 = 1988
2.50 + 1985.5 = 1988
3.75 + 1984.25 = 1988
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 1988?", 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 1988. (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 1988?" has 994 answers:

1 + 1987 = 1988
2 + 1986 = 1988
3 + 1985 = 1988
.
.
992 + 996 = 1988
993 + 995 = 1988
994 + 994 = 1988

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 1988 by 2 and then rounded down to the nearest whole number if necessary.

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What two numbers add up to 1989?
Here is the next problem on our list that we answered and explained in a similar fashion.