When you ask "What number is halfway between 4 and 215?" 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=215.
To find the number halfway between 4 and 215, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 215 into our formula, we get:
(4 + 215)/2 = 109.5
Thus, the number halfway between 4 and 215 is 109.5.
To check that our answer is correct, we subtract 4 from 109.5 and subtract 109.5 from 215 and compare the two numbers:
109.5 - 4 = 105.5
215 - 109.5 = 105.5
As you can see, the halfway number is 105.5 higher than 4 and 105.5 lower than 215. Therefore, our halfway between answer of 109.5 above is correct.
Halfway Between
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