When you ask "What number is halfway between 15 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=15 and Y=308.
To find the number halfway between 15 and 308, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 308 into our formula, we get:
(15 + 308)/2 = 161.5
Thus, the number halfway between 15 and 308 is 161.5.
To check that our answer is correct, we subtract 15 from 161.5 and subtract 161.5 from 308 and compare the two numbers:
161.5 - 15 = 146.5
308 - 161.5 = 146.5
As you can see, the halfway number is 146.5 higher than 15 and 146.5 lower than 308. Therefore, our halfway between answer of 161.5 above is correct.
Halfway Between
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Halfway Between 15 and 309
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