When you ask "What number is halfway between 4 and 39?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=4 and Y=39.
To find the number halfway between 4 and 39, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 39 into our formula, we get:
(4 + 39)/2 = 21.5
Thus, the number halfway between 4 and 39 is 21.5.
To check that our answer is correct, we subtract 4 from 21.5 and subtract 21.5 from 39 and compare the two numbers:
21.5 - 4 = 17.5
39 - 21.5 = 17.5
As you can see, the halfway number is 17.5 higher than 4 and 17.5 lower than 39. Therefore, our halfway between answer of 21.5 above is correct.
Halfway Between
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Halfway Between 4 and 40
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