What two numbers add up to 4220?

There are infinite combinations of two numbers that add up to 4220. Here are some examples using negative numbers:

-1 + 4221 = 4220
-2 + 4222 = 4220
-3 + 4223 = 4220
...

Here are some examples using two fractions that will add up to 4220:

4220/2 + 4220/2 = 4220
8440/3 + 4220/3 = 4220
12660/4 + 4220/4 = 4220
...

And here are some examples using two decimal numbers that will add up to 4220:

1.25 + 4218.75 = 4220
2.50 + 4217.5 = 4220
3.75 + 4216.25 = 4220
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 4220?", 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 4220. (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 4220?" has 2110 answers:

1 + 4219 = 4220
2 + 4218 = 4220
3 + 4217 = 4220
.
.
2108 + 2112 = 4220
2109 + 2111 = 4220
2110 + 2110 = 4220

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 4220 by 2 and then rounded down to the nearest whole number if necessary.

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