When you ask "What number is halfway between 89 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=89 and Y=138.
To find the number halfway between 89 and 138, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 89 and 138 into our formula, we get:
(89 + 138)/2 = 113.5
Thus, the number halfway between 89 and 138 is 113.5.
To check that our answer is correct, we subtract 89 from 113.5 and subtract 113.5 from 138 and compare the two numbers:
113.5 - 89 = 24.5
138 - 113.5 = 24.5
As you can see, the halfway number is 24.5 higher than 89 and 24.5 lower than 138. Therefore, our halfway between answer of 113.5 above is correct.
Halfway Between
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Halfway Between 89 and 139
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