When you ask "What number is halfway between 15 and 288?" 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=288.
To find the number halfway between 15 and 288, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 288 into our formula, we get:
(15 + 288)/2 = 151.5
Thus, the number halfway between 15 and 288 is 151.5.
To check that our answer is correct, we subtract 15 from 151.5 and subtract 151.5 from 288 and compare the two numbers:
151.5 - 15 = 136.5
288 - 151.5 = 136.5
As you can see, the halfway number is 136.5 higher than 15 and 136.5 lower than 288. Therefore, our halfway between answer of 151.5 above is correct.
Halfway Between
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Halfway Between 15 and 289
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