When you ask "What number is halfway between 18 and 329?" 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=329.
To find the number halfway between 18 and 329, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 329 into our formula, we get:
(18 + 329)/2 = 173.5
Thus, the number halfway between 18 and 329 is 173.5.
To check that our answer is correct, we subtract 18 from 173.5 and subtract 173.5 from 329 and compare the two numbers:
173.5 - 18 = 155.5
329 - 173.5 = 155.5
As you can see, the halfway number is 155.5 higher than 18 and 155.5 lower than 329. Therefore, our halfway between answer of 173.5 above is correct.
Halfway Between
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Halfway Between 18 and 330
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