Halfway Between 13 and 999

When you ask "What number is halfway between 13 and 999?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=13 and Y=999.

Halfway Between Line

To find the number halfway between 13 and 999, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 13 and 999 into our formula, we get:

(13 + 999)/2 = 506

Thus, the number halfway between 13 and 999 is 506.

To check that our answer is correct, we subtract 13 from 506 and subtract 506 from 999 and compare the two numbers:

506 - 13 = 493
999 - 506 = 493

As you can see, the halfway number is 493 higher than 13 and 493 lower than 999. Therefore, our halfway between answer of 506 above is correct.

Halfway Between
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Halfway Between 13 and 1000
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