When you ask "What number is halfway between 13 and 618?" 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=618.
To find the number halfway between 13 and 618, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 13 and 618 into our formula, we get:
(13 + 618)/2 = 315.5
Thus, the number halfway between 13 and 618 is 315.5.
To check that our answer is correct, we subtract 13 from 315.5 and subtract 315.5 from 618 and compare the two numbers:
315.5 - 13 = 302.5
618 - 315.5 = 302.5
As you can see, the halfway number is 302.5 higher than 13 and 302.5 lower than 618. Therefore, our halfway between answer of 315.5 above is correct.
Halfway Between
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Halfway Between 13 and 619
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