When you ask "What number is halfway between 85 and 172?" 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=172.
To find the number halfway between 85 and 172, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 85 and 172 into our formula, we get:
(85 + 172)/2 = 128.5
Thus, the number halfway between 85 and 172 is 128.5.
To check that our answer is correct, we subtract 85 from 128.5 and subtract 128.5 from 172 and compare the two numbers:
128.5 - 85 = 43.5
172 - 128.5 = 43.5
As you can see, the halfway number is 43.5 higher than 85 and 43.5 lower than 172. Therefore, our halfway between answer of 128.5 above is correct.
Halfway Between
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Halfway Between 85 and 173
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