When you ask "What number is halfway between 65 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=65 and Y=139.
To find the number halfway between 65 and 139, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 65 and 139 into our formula, we get:
(65 + 139)/2 = 102
Thus, the number halfway between 65 and 139 is 102.
To check that our answer is correct, we subtract 65 from 102 and subtract 102 from 139 and compare the two numbers:
102 - 65 = 37
139 - 102 = 37
As you can see, the halfway number is 37 higher than 65 and 37 lower than 139. Therefore, our halfway between answer of 102 above is correct.
Halfway Between
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Halfway Between 65 and 140
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