When you ask "What number is halfway between 85 and 218?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=85 and Y=218.
To find the number halfway between 85 and 218, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 85 and 218 into our formula, we get:
(85 + 218)/2 = 151.5
Thus, the number halfway between 85 and 218 is 151.5.
To check that our answer is correct, we subtract 85 from 151.5 and subtract 151.5 from 218 and compare the two numbers:
151.5 - 85 = 66.5
218 - 151.5 = 66.5
As you can see, the halfway number is 66.5 higher than 85 and 66.5 lower than 218. Therefore, our halfway between answer of 151.5 above is correct.
Halfway Between
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Halfway Between 85 and 219
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