
When you ask "What number is halfway between 4 and 253?" 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=253.

To find the number halfway between 4 and 253, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 253 into our formula, we get:
(4 + 253)/2 = 128.5
Thus, the number halfway between 4 and 253 is 128.5.
To check that our answer is correct, we subtract 4 from 128.5 and subtract 128.5 from 253 and compare the two numbers:
128.5 - 4 = 124.5
253 - 128.5 = 124.5
As you can see, the halfway number is 124.5 higher than 4 and 124.5 lower than 253. Therefore, our halfway between answer of 128.5 above is correct.
Halfway Between
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Halfway Between 4 and 254
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