When you ask "What number is halfway between 89 and 216?" 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=216.
To find the number halfway between 89 and 216, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 89 and 216 into our formula, we get:
(89 + 216)/2 = 152.5
Thus, the number halfway between 89 and 216 is 152.5.
To check that our answer is correct, we subtract 89 from 152.5 and subtract 152.5 from 216 and compare the two numbers:
152.5 - 89 = 63.5
216 - 152.5 = 63.5
As you can see, the halfway number is 63.5 higher than 89 and 63.5 lower than 216. Therefore, our halfway between answer of 152.5 above is correct.
Halfway Between
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Halfway Between 89 and 217
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