When you ask "What number is halfway between 85 and 115?" 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=115.
To find the number halfway between 85 and 115, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 85 and 115 into our formula, we get:
(85 + 115)/2 = 100
Thus, the number halfway between 85 and 115 is 100.
To check that our answer is correct, we subtract 85 from 100 and subtract 100 from 115 and compare the two numbers:
100 - 85 = 15
115 - 100 = 15
As you can see, the halfway number is 15 higher than 85 and 15 lower than 115. Therefore, our halfway between answer of 100 above is correct.
Halfway Between
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Halfway Between 85 and 116
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