When you ask "What number is halfway between 18 and 308?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=18 and Y=308.
To find the number halfway between 18 and 308, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 308 into our formula, we get:
(18 + 308)/2 = 163
Thus, the number halfway between 18 and 308 is 163.
To check that our answer is correct, we subtract 18 from 163 and subtract 163 from 308 and compare the two numbers:
163 - 18 = 145
308 - 163 = 145
As you can see, the halfway number is 145 higher than 18 and 145 lower than 308. Therefore, our halfway between answer of 163 above is correct.
Halfway Between
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Halfway Between 18 and 309
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