When you ask "What number is halfway between 82 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=82 and Y=217.
To find the number halfway between 82 and 217, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 82 and 217 into our formula, we get:
(82 + 217)/2 = 149.5
Thus, the number halfway between 82 and 217 is 149.5.
To check that our answer is correct, we subtract 82 from 149.5 and subtract 149.5 from 217 and compare the two numbers:
149.5 - 82 = 67.5
217 - 149.5 = 67.5
As you can see, the halfway number is 67.5 higher than 82 and 67.5 lower than 217. Therefore, our halfway between answer of 149.5 above is correct.
Halfway Between
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Halfway Between 82 and 218
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