
When you ask "What number is halfway between 55 and 259?" 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=259.

To find the number halfway between 55 and 259, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 259 into our formula, we get:
(55 + 259)/2 = 157
Thus, the number halfway between 55 and 259 is 157.
To check that our answer is correct, we subtract 55 from 157 and subtract 157 from 259 and compare the two numbers:
157 - 55 = 102
259 - 157 = 102
As you can see, the halfway number is 102 higher than 55 and 102 lower than 259. Therefore, our halfway between answer of 157 above is correct.
Halfway Between
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Halfway Between 55 and 260
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