When you ask "What number is halfway between 18 and 717?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=18 and Y=717.
To find the number halfway between 18 and 717, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 717 into our formula, we get:
(18 + 717)/2 = 367.5
Thus, the number halfway between 18 and 717 is 367.5.
To check that our answer is correct, we subtract 18 from 367.5 and subtract 367.5 from 717 and compare the two numbers:
367.5 - 18 = 349.5
717 - 367.5 = 349.5
As you can see, the halfway number is 349.5 higher than 18 and 349.5 lower than 717. Therefore, our halfway between answer of 367.5 above is correct.
Halfway Between
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Halfway Between 18 and 718
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