
When you ask "What number is halfway between 4 and 161?" 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=161.

To find the number halfway between 4 and 161, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 161 into our formula, we get:
(4 + 161)/2 = 82.5
Thus, the number halfway between 4 and 161 is 82.5.
To check that our answer is correct, we subtract 4 from 82.5 and subtract 82.5 from 161 and compare the two numbers:
82.5 - 4 = 78.5
161 - 82.5 = 78.5
As you can see, the halfway number is 78.5 higher than 4 and 78.5 lower than 161. Therefore, our halfway between answer of 82.5 above is correct.
Halfway Between
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Halfway Between 4 and 162
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