When you ask "What number is halfway between 40 and 217?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=40 and Y=217.
To find the number halfway between 40 and 217, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 40 and 217 into our formula, we get:
(40 + 217)/2 = 128.5
Thus, the number halfway between 40 and 217 is 128.5.
To check that our answer is correct, we subtract 40 from 128.5 and subtract 128.5 from 217 and compare the two numbers:
128.5 - 40 = 88.5
217 - 128.5 = 88.5
As you can see, the halfway number is 88.5 higher than 40 and 88.5 lower than 217. Therefore, our halfway between answer of 128.5 above is correct.
Halfway Between
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Halfway Between 40 and 218
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