When you ask "What number is halfway between 13 and 818?" 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=818.
To find the number halfway between 13 and 818, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 13 and 818 into our formula, we get:
(13 + 818)/2 = 415.5
Thus, the number halfway between 13 and 818 is 415.5.
To check that our answer is correct, we subtract 13 from 415.5 and subtract 415.5 from 818 and compare the two numbers:
415.5 - 13 = 402.5
818 - 415.5 = 402.5
As you can see, the halfway number is 402.5 higher than 13 and 402.5 lower than 818. Therefore, our halfway between answer of 415.5 above is correct.
Halfway Between
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Halfway Between 13 and 819
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