When you ask "What number is halfway between 50 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=50 and Y=139.
To find the number halfway between 50 and 139, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 50 and 139 into our formula, we get:
(50 + 139)/2 = 94.5
Thus, the number halfway between 50 and 139 is 94.5.
To check that our answer is correct, we subtract 50 from 94.5 and subtract 94.5 from 139 and compare the two numbers:
94.5 - 50 = 44.5
139 - 94.5 = 44.5
As you can see, the halfway number is 44.5 higher than 50 and 44.5 lower than 139. Therefore, our halfway between answer of 94.5 above is correct.
Halfway Between
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Halfway Between 50 and 140
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