When you ask "What number is halfway between 18 and 635?" 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=635.
To find the number halfway between 18 and 635, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 635 into our formula, we get:
(18 + 635)/2 = 326.5
Thus, the number halfway between 18 and 635 is 326.5.
To check that our answer is correct, we subtract 18 from 326.5 and subtract 326.5 from 635 and compare the two numbers:
326.5 - 18 = 308.5
635 - 326.5 = 308.5
As you can see, the halfway number is 308.5 higher than 18 and 308.5 lower than 635. Therefore, our halfway between answer of 326.5 above is correct.
Halfway Between
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Halfway Between 18 and 636
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