When you ask "What number is halfway between 15 and 388?" 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=388.
To find the number halfway between 15 and 388, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 388 into our formula, we get:
(15 + 388)/2 = 201.5
Thus, the number halfway between 15 and 388 is 201.5.
To check that our answer is correct, we subtract 15 from 201.5 and subtract 201.5 from 388 and compare the two numbers:
201.5 - 15 = 186.5
388 - 201.5 = 186.5
As you can see, the halfway number is 186.5 higher than 15 and 186.5 lower than 388. Therefore, our halfway between answer of 201.5 above is correct.
Halfway Between
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Halfway Between 15 and 389
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