
When you ask "What number is halfway between 4 and 99?" 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=99.

To find the number halfway between 4 and 99, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 99 into our formula, we get:
(4 + 99)/2 = 51.5
Thus, the number halfway between 4 and 99 is 51.5.
To check that our answer is correct, we subtract 4 from 51.5 and subtract 51.5 from 99 and compare the two numbers:
51.5 - 4 = 47.5
99 - 51.5 = 47.5
As you can see, the halfway number is 47.5 higher than 4 and 47.5 lower than 99. Therefore, our halfway between answer of 51.5 above is correct.
Halfway Between
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Halfway Between 4 and 100
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