
When you ask "What number is halfway between 17 and 45?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=17 and Y=45.

To find the number halfway between 17 and 45, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 45 into our formula, we get:
(17 + 45)/2 = 31
Thus, the number halfway between 17 and 45 is 31.
To check that our answer is correct, we subtract 17 from 31 and subtract 31 from 45 and compare the two numbers:
31 - 17 = 14
45 - 31 = 14
As you can see, the halfway number is 14 higher than 17 and 14 lower than 45. Therefore, our halfway between answer of 31 above is correct.
Halfway Between
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Halfway Between 17 and 46
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