What two numbers add up to 2020?

There are infinite combinations of two numbers that add up to 2020. Here are some examples using negative numbers:

-1 + 2021 = 2020
-2 + 2022 = 2020
-3 + 2023 = 2020
...

Here are some examples using two fractions that will add up to 2020:

2020/2 + 2020/2 = 2020
4040/3 + 2020/3 = 2020
6060/4 + 2020/4 = 2020
...

And here are some examples using two decimal numbers that will add up to 2020:

1.25 + 2018.75 = 2020
2.50 + 2017.5 = 2020
3.75 + 2016.25 = 2020
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 2020?", 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 2020. (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 2020?" has 1010 answers:

1 + 2019 = 2020
2 + 2018 = 2020
3 + 2017 = 2020
.
.
1008 + 1012 = 2020
1009 + 1011 = 2020
1010 + 1010 = 2020

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 2020 by 2 and then rounded down to the nearest whole number if necessary.

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What two numbers add up to 2021?
Here is the next problem on our list that we answered and explained in a similar fashion.