When you ask "What number is halfway between 15 and 318?" 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=318.
To find the number halfway between 15 and 318, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 318 into our formula, we get:
(15 + 318)/2 = 166.5
Thus, the number halfway between 15 and 318 is 166.5.
To check that our answer is correct, we subtract 15 from 166.5 and subtract 166.5 from 318 and compare the two numbers:
166.5 - 15 = 151.5
318 - 166.5 = 151.5
As you can see, the halfway number is 151.5 higher than 15 and 151.5 lower than 318. Therefore, our halfway between answer of 166.5 above is correct.
Halfway Between
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Halfway Between 15 and 319
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