When you ask "What number is halfway between 10 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=10 and Y=17.
To find the number halfway between 10 and 17, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 17 into our formula, we get:
(10 + 17)/2 = 13.5
Thus, the number halfway between 10 and 17 is 13.5.
To check that our answer is correct, we subtract 10 from 13.5 and subtract 13.5 from 17 and compare the two numbers:
13.5 - 10 = 3.5
17 - 13.5 = 3.5
As you can see, the halfway number is 3.5 higher than 10 and 3.5 lower than 17. Therefore, our halfway between answer of 13.5 above is correct.
Halfway Between
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