
When you ask "What number is halfway between 4 and 310?" 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=310.

To find the number halfway between 4 and 310, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 310 into our formula, we get:
(4 + 310)/2 = 157
Thus, the number halfway between 4 and 310 is 157.
To check that our answer is correct, we subtract 4 from 157 and subtract 157 from 310 and compare the two numbers:
157 - 4 = 153
310 - 157 = 153
As you can see, the halfway number is 153 higher than 4 and 153 lower than 310. Therefore, our halfway between answer of 157 above is correct.
Halfway Between
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Halfway Between 4 and 311
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