When you ask "What number is halfway between 3 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=3 and Y=139.
To find the number halfway between 3 and 139, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 3 and 139 into our formula, we get:
(3 + 139)/2 = 71
Thus, the number halfway between 3 and 139 is 71.
To check that our answer is correct, we subtract 3 from 71 and subtract 71 from 139 and compare the two numbers:
71 - 3 = 68
139 - 71 = 68
As you can see, the halfway number is 68 higher than 3 and 68 lower than 139. Therefore, our halfway between answer of 71 above is correct.
Halfway Between
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Halfway Between 3 and 140
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