When you ask "What number is halfway between 20 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=20 and Y=85.
To find the number halfway between 20 and 85, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 85 into our formula, we get:
(20 + 85)/2 = 52.5
Thus, the number halfway between 20 and 85 is 52.5.
To check that our answer is correct, we subtract 20 from 52.5 and subtract 52.5 from 85 and compare the two numbers:
52.5 - 20 = 32.5
85 - 52.5 = 32.5
As you can see, the halfway number is 32.5 higher than 20 and 32.5 lower than 85. Therefore, our halfway between answer of 52.5 above is correct.
Halfway Between
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Halfway Between 20 and 86
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