When you ask "What number is halfway between 85 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=85 and Y=138.
To find the number halfway between 85 and 138, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 85 and 138 into our formula, we get:
(85 + 138)/2 = 111.5
Thus, the number halfway between 85 and 138 is 111.5.
To check that our answer is correct, we subtract 85 from 111.5 and subtract 111.5 from 138 and compare the two numbers:
111.5 - 85 = 26.5
138 - 111.5 = 26.5
As you can see, the halfway number is 26.5 higher than 85 and 26.5 lower than 138. Therefore, our halfway between answer of 111.5 above is correct.
Halfway Between
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Halfway Between 85 and 139
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