
When you ask "What number is halfway between 55 and 138?" 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=138.

To find the number halfway between 55 and 138, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 138 into our formula, we get:
(55 + 138)/2 = 96.5
Thus, the number halfway between 55 and 138 is 96.5.
To check that our answer is correct, we subtract 55 from 96.5 and subtract 96.5 from 138 and compare the two numbers:
96.5 - 55 = 41.5
138 - 96.5 = 41.5
As you can see, the halfway number is 41.5 higher than 55 and 41.5 lower than 138. Therefore, our halfway between answer of 96.5 above is correct.
Halfway Between
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Halfway Between 55 and 139
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