What two numbers add up to 9920?

There are infinite combinations of two numbers that add up to 9920. Here are some examples using negative numbers:

-1 + 9921 = 9920
-2 + 9922 = 9920
-3 + 9923 = 9920
...

Here are some examples using two fractions that will add up to 9920:

9920/2 + 9920/2 = 9920
19840/3 + 9920/3 = 9920
29760/4 + 9920/4 = 9920
...

And here are some examples using two decimal numbers that will add up to 9920:

1.25 + 9918.75 = 9920
2.50 + 9917.5 = 9920
3.75 + 9916.25 = 9920
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 9920?", 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 9920. (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 9920?" has 4960 answers:

1 + 9919 = 9920
2 + 9918 = 9920
3 + 9917 = 9920
.
.
4958 + 4962 = 9920
4959 + 4961 = 9920
4960 + 4960 = 9920

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 9920 by 2 and then rounded down to the nearest whole number if necessary.

Numbers That Add Up To Calculator
Submit another "What two numbers add up to x?" problem here.

What two numbers add up to 9921?
Here is the next problem on our list that we answered and explained in a similar fashion.