
When you ask "What number is halfway between 1 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=1 and Y=170.

To find the number halfway between 1 and 170, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 1 and 170 into our formula, we get:
(1 + 170)/2 = 85.5
Thus, the number halfway between 1 and 170 is 85.5.
To check that our answer is correct, we subtract 1 from 85.5 and subtract 85.5 from 170 and compare the two numbers:
85.5 - 1 = 84.5
170 - 85.5 = 84.5
As you can see, the halfway number is 84.5 higher than 1 and 84.5 lower than 170. Therefore, our halfway between answer of 85.5 above is correct.
Halfway Between
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Halfway Between 1 and 171
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