When you ask "What number is halfway between 85 and 156?" 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=156.
To find the number halfway between 85 and 156, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 85 and 156 into our formula, we get:
(85 + 156)/2 = 120.5
Thus, the number halfway between 85 and 156 is 120.5.
To check that our answer is correct, we subtract 85 from 120.5 and subtract 120.5 from 156 and compare the two numbers:
120.5 - 85 = 35.5
156 - 120.5 = 35.5
As you can see, the halfway number is 35.5 higher than 85 and 35.5 lower than 156. Therefore, our halfway between answer of 120.5 above is correct.
Halfway Between
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Halfway Between 85 and 157
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