When you ask "What number is halfway between 0 and 85?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=0 and Y=85.
To find the number halfway between 0 and 85, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 0 and 85 into our formula, we get:
(0 + 85)/2 = 42.5
Thus, the number halfway between 0 and 85 is 42.5.
To check that our answer is correct, we subtract 0 from 42.5 and subtract 42.5 from 85 and compare the two numbers:
42.5 - 0 = 42.5
85 - 42.5 = 42.5
As you can see, the halfway number is 42.5 higher than 0 and 42.5 lower than 85. Therefore, our halfway between answer of 42.5 above is correct.
Halfway Between
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Halfway Between 0 and 86
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