When you ask "What number is halfway between 71 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=71 and Y=139.
To find the number halfway between 71 and 139, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 71 and 139 into our formula, we get:
(71 + 139)/2 = 105
Thus, the number halfway between 71 and 139 is 105.
To check that our answer is correct, we subtract 71 from 105 and subtract 105 from 139 and compare the two numbers:
105 - 71 = 34
139 - 105 = 34
As you can see, the halfway number is 34 higher than 71 and 34 lower than 139. Therefore, our halfway between answer of 105 above is correct.
Halfway Between
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Halfway Between 71 and 140
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