What two numbers add up to 1000?

There are infinite combinations of two numbers that add up to 1000. Here are some examples using negative numbers:

-1 + 1001 = 1000
-2 + 1002 = 1000
-3 + 1003 = 1000
...

Here are some examples using two fractions that will add up to 1000:

1000/2 + 1000/2 = 1000
2000/3 + 1000/3 = 1000
3000/4 + 1000/4 = 1000
...

And here are some examples using two decimal numbers that will add up to 1000:

1.25 + 998.75 = 1000
2.50 + 997.5 = 1000
3.75 + 996.25 = 1000
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 1000?", 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 1000. (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 1000?" has 500 answers:

1 + 999 = 1000
2 + 998 = 1000
3 + 997 = 1000
.
.
498 + 502 = 1000
499 + 501 = 1000
500 + 500 = 1000

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 1000 by 2 and then rounded down to the nearest whole number if necessary.

Numbers That Add Up To Calculator
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What two numbers add up to 1001?
Here is the next problem on our list that we answered and explained in a similar fashion.