What two numbers add up to 428?

There are infinite combinations of two numbers that add up to 428. Here are some examples using negative numbers:

-1 + 429 = 428
-2 + 430 = 428
-3 + 431 = 428
...

Here are some examples using two fractions that will add up to 428:

428/2 + 428/2 = 428
856/3 + 428/3 = 428
1284/4 + 428/4 = 428
...

And here are some examples using two decimal numbers that will add up to 428:

1.25 + 426.75 = 428
2.50 + 425.5 = 428
3.75 + 424.25 = 428
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 428?", 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 428. (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 428?" has 214 answers:

1 + 427 = 428
2 + 426 = 428
3 + 425 = 428
.
.
212 + 216 = 428
213 + 215 = 428
214 + 214 = 428

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

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