When you ask "What number is halfway between 90 and 139?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=90 and Y=139.
To find the number halfway between 90 and 139, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 139 into our formula, we get:
(90 + 139)/2 = 114.5
Thus, the number halfway between 90 and 139 is 114.5.
To check that our answer is correct, we subtract 90 from 114.5 and subtract 114.5 from 139 and compare the two numbers:
114.5 - 90 = 24.5
139 - 114.5 = 24.5
As you can see, the halfway number is 24.5 higher than 90 and 24.5 lower than 139. Therefore, our halfway between answer of 114.5 above is correct.
Halfway Between
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Halfway Between 90 and 140
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