When you ask "What number is halfway between 8 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=8 and Y=139.
To find the number halfway between 8 and 139, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 8 and 139 into our formula, we get:
(8 + 139)/2 = 73.5
Thus, the number halfway between 8 and 139 is 73.5.
To check that our answer is correct, we subtract 8 from 73.5 and subtract 73.5 from 139 and compare the two numbers:
73.5 - 8 = 65.5
139 - 73.5 = 65.5
As you can see, the halfway number is 65.5 higher than 8 and 65.5 lower than 139. Therefore, our halfway between answer of 73.5 above is correct.
Halfway Between
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Halfway Between 8 and 140
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