
When you ask "What number is halfway between 15 and 110?" 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=110.

To find the number halfway between 15 and 110, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 110 into our formula, we get:
(15 + 110)/2 = 62.5
Thus, the number halfway between 15 and 110 is 62.5.
To check that our answer is correct, we subtract 15 from 62.5 and subtract 62.5 from 110 and compare the two numbers:
62.5 - 15 = 47.5
110 - 62.5 = 47.5
As you can see, the halfway number is 47.5 higher than 15 and 47.5 lower than 110. Therefore, our halfway between answer of 62.5 above is correct.
Halfway Between
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Halfway Between 15 and 111
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