When you ask "What number is halfway between 5 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=5 and Y=139.
To find the number halfway between 5 and 139, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 5 and 139 into our formula, we get:
(5 + 139)/2 = 72
Thus, the number halfway between 5 and 139 is 72.
To check that our answer is correct, we subtract 5 from 72 and subtract 72 from 139 and compare the two numbers:
72 - 5 = 67
139 - 72 = 67
As you can see, the halfway number is 67 higher than 5 and 67 lower than 139. Therefore, our halfway between answer of 72 above is correct.
Halfway Between
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Halfway Between 5 and 140
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