When you ask "What number is halfway between 18 and 323?" 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=323.
To find the number halfway between 18 and 323, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 323 into our formula, we get:
(18 + 323)/2 = 170.5
Thus, the number halfway between 18 and 323 is 170.5.
To check that our answer is correct, we subtract 18 from 170.5 and subtract 170.5 from 323 and compare the two numbers:
170.5 - 18 = 152.5
323 - 170.5 = 152.5
As you can see, the halfway number is 152.5 higher than 18 and 152.5 lower than 323. Therefore, our halfway between answer of 170.5 above is correct.
Halfway Between
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Halfway Between 18 and 324
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