
When you ask "What number is halfway between 89 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=89 and Y=217.

To find the number halfway between 89 and 217, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 89 and 217 into our formula, we get:
(89 + 217)/2 = 153
Thus, the number halfway between 89 and 217 is 153.
To check that our answer is correct, we subtract 89 from 153 and subtract 153 from 217 and compare the two numbers:
153 - 89 = 64
217 - 153 = 64
As you can see, the halfway number is 64 higher than 89 and 64 lower than 217. Therefore, our halfway between answer of 153 above is correct.
Halfway Between
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Halfway Between 89 and 218
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