When you ask "What number is halfway between 85 and 120?" 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=120.
To find the number halfway between 85 and 120, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 85 and 120 into our formula, we get:
(85 + 120)/2 = 102.5
Thus, the number halfway between 85 and 120 is 102.5.
To check that our answer is correct, we subtract 85 from 102.5 and subtract 102.5 from 120 and compare the two numbers:
102.5 - 85 = 17.5
120 - 102.5 = 17.5
As you can see, the halfway number is 17.5 higher than 85 and 17.5 lower than 120. Therefore, our halfway between answer of 102.5 above is correct.
Halfway Between
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Halfway Between 85 and 121
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