
When you ask "What number is halfway between 55 and 285?" 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=285.

To find the number halfway between 55 and 285, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 285 into our formula, we get:
(55 + 285)/2 = 170
Thus, the number halfway between 55 and 285 is 170.
To check that our answer is correct, we subtract 55 from 170 and subtract 170 from 285 and compare the two numbers:
170 - 55 = 115
285 - 170 = 115
As you can see, the halfway number is 115 higher than 55 and 115 lower than 285. Therefore, our halfway between answer of 170 above is correct.
Halfway Between
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Halfway Between 55 and 286
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