When you ask "What number is halfway between 85 and 170?" 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=170.
To find the number halfway between 85 and 170, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 85 and 170 into our formula, we get:
(85 + 170)/2 = 127.5
Thus, the number halfway between 85 and 170 is 127.5.
To check that our answer is correct, we subtract 85 from 127.5 and subtract 127.5 from 170 and compare the two numbers:
127.5 - 85 = 42.5
170 - 127.5 = 42.5
As you can see, the halfway number is 42.5 higher than 85 and 42.5 lower than 170. Therefore, our halfway between answer of 127.5 above is correct.
Halfway Between
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Halfway Between 85 and 171
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