When you ask "What number is halfway between 4 and 415?" 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=415.
To find the number halfway between 4 and 415, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 415 into our formula, we get:
(4 + 415)/2 = 209.5
Thus, the number halfway between 4 and 415 is 209.5.
To check that our answer is correct, we subtract 4 from 209.5 and subtract 209.5 from 415 and compare the two numbers:
209.5 - 4 = 205.5
415 - 209.5 = 205.5
As you can see, the halfway number is 205.5 higher than 4 and 205.5 lower than 415. Therefore, our halfway between answer of 209.5 above is correct.
Halfway Between
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Halfway Between 4 and 416
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