When you ask "What number is halfway between 8 and 17?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=8 and Y=17.
To find the number halfway between 8 and 17, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 8 and 17 into our formula, we get:
(8 + 17)/2 = 12.5
Thus, the number halfway between 8 and 17 is 12.5.
To check that our answer is correct, we subtract 8 from 12.5 and subtract 12.5 from 17 and compare the two numbers:
12.5 - 8 = 4.5
17 - 12.5 = 4.5
As you can see, the halfway number is 4.5 higher than 8 and 4.5 lower than 17. Therefore, our halfway between answer of 12.5 above is correct.
Halfway Between
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