
When you ask "What number is halfway between 55 and 366?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=55 and Y=366.

To find the number halfway between 55 and 366, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 366 into our formula, we get:
(55 + 366)/2 = 210.5
Thus, the number halfway between 55 and 366 is 210.5.
To check that our answer is correct, we subtract 55 from 210.5 and subtract 210.5 from 366 and compare the two numbers:
210.5 - 55 = 155.5
366 - 210.5 = 155.5
As you can see, the halfway number is 155.5 higher than 55 and 155.5 lower than 366. Therefore, our halfway between answer of 210.5 above is correct.
Halfway Between
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Halfway Between 55 and 367
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