
When you ask "What number is halfway between 4 and 75?" 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=75.

To find the number halfway between 4 and 75, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 75 into our formula, we get:
(4 + 75)/2 = 39.5
Thus, the number halfway between 4 and 75 is 39.5.
To check that our answer is correct, we subtract 4 from 39.5 and subtract 39.5 from 75 and compare the two numbers:
39.5 - 4 = 35.5
75 - 39.5 = 35.5
As you can see, the halfway number is 35.5 higher than 4 and 35.5 lower than 75. Therefore, our halfway between answer of 39.5 above is correct.
Halfway Between
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Halfway Between 4 and 76
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