What two numbers add up to 1780?

There are infinite combinations of two numbers that add up to 1780. Here are some examples using negative numbers:

-1 + 1781 = 1780
-2 + 1782 = 1780
-3 + 1783 = 1780
...

Here are some examples using two fractions that will add up to 1780:

1780/2 + 1780/2 = 1780
3560/3 + 1780/3 = 1780
5340/4 + 1780/4 = 1780
...

And here are some examples using two decimal numbers that will add up to 1780:

1.25 + 1778.75 = 1780
2.50 + 1777.5 = 1780
3.75 + 1776.25 = 1780
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 1780?", 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 1780. (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 1780?" has 890 answers:

1 + 1779 = 1780
2 + 1778 = 1780
3 + 1777 = 1780
.
.
888 + 892 = 1780
889 + 891 = 1780
890 + 890 = 1780

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 1780 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 1781?
Here is the next problem on our list that we answered and explained in a similar fashion.