
When you ask "What number is halfway between 66 and 165?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=66 and Y=165.

To find the number halfway between 66 and 165, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 66 and 165 into our formula, we get:
(66 + 165)/2 = 115.5
Thus, the number halfway between 66 and 165 is 115.5.
To check that our answer is correct, we subtract 66 from 115.5 and subtract 115.5 from 165 and compare the two numbers:
115.5 - 66 = 49.5
165 - 115.5 = 49.5
As you can see, the halfway number is 49.5 higher than 66 and 49.5 lower than 165. Therefore, our halfway between answer of 115.5 above is correct.
Halfway Between
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Halfway Between 66 and 166
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