What two numbers add up to 1987?

There are infinite combinations of two numbers that add up to 1987. Here are some examples using negative numbers:

-1 + 1988 = 1987
-2 + 1989 = 1987
-3 + 1990 = 1987
...

Here are some examples using two fractions that will add up to 1987:

1987/2 + 1987/2 = 1987
3974/3 + 1987/3 = 1987
5961/4 + 1987/4 = 1987
...

And here are some examples using two decimal numbers that will add up to 1987:

1.25 + 1985.75 = 1987
2.50 + 1984.5 = 1987
3.75 + 1983.25 = 1987
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 1987?", 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 1987. (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 1987?" has 993 answers:

1 + 1986 = 1987
2 + 1985 = 1987
3 + 1984 = 1987
.
.
991 + 996 = 1987
992 + 995 = 1987
993 + 994 = 1987

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 1987 by 2 and then rounded down to the nearest whole number if necessary.

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What two numbers add up to 1988?
Here is the next problem on our list that we answered and explained in a similar fashion.