
When you ask "What number is halfway between 0 and 55?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=0 and Y=55.

To find the number halfway between 0 and 55, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 0 and 55 into our formula, we get:
(0 + 55)/2 = 27.5
Thus, the number halfway between 0 and 55 is 27.5.
To check that our answer is correct, we subtract 0 from 27.5 and subtract 27.5 from 55 and compare the two numbers:
27.5 - 0 = 27.5
55 - 27.5 = 27.5
As you can see, the halfway number is 27.5 higher than 0 and 27.5 lower than 55. Therefore, our halfway between answer of 27.5 above is correct.
Halfway Between
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Halfway Between 0 and 56
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