When you ask "What number is halfway between 12 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=12 and Y=215.
To find the number halfway between 12 and 215, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 215 into our formula, we get:
(12 + 215)/2 = 113.5
Thus, the number halfway between 12 and 215 is 113.5.
To check that our answer is correct, we subtract 12 from 113.5 and subtract 113.5 from 215 and compare the two numbers:
113.5 - 12 = 101.5
215 - 113.5 = 101.5
As you can see, the halfway number is 101.5 higher than 12 and 101.5 lower than 215. Therefore, our halfway between answer of 113.5 above is correct.
Halfway Between
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Halfway Between 12 and 216
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