When you ask "What number is halfway between 20 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=20 and Y=215.
To find the number halfway between 20 and 215, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 215 into our formula, we get:
(20 + 215)/2 = 117.5
Thus, the number halfway between 20 and 215 is 117.5.
To check that our answer is correct, we subtract 20 from 117.5 and subtract 117.5 from 215 and compare the two numbers:
117.5 - 20 = 97.5
215 - 117.5 = 97.5
As you can see, the halfway number is 97.5 higher than 20 and 97.5 lower than 215. Therefore, our halfway between answer of 117.5 above is correct.
Halfway Between
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