When you ask "What number is halfway between 85 and 220?" 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=220.
To find the number halfway between 85 and 220, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 85 and 220 into our formula, we get:
(85 + 220)/2 = 152.5
Thus, the number halfway between 85 and 220 is 152.5.
To check that our answer is correct, we subtract 85 from 152.5 and subtract 152.5 from 220 and compare the two numbers:
152.5 - 85 = 67.5
220 - 152.5 = 67.5
As you can see, the halfway number is 67.5 higher than 85 and 67.5 lower than 220. Therefore, our halfway between answer of 152.5 above is correct.
Halfway Between
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Halfway Between 85 and 221
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