
When you ask "What number is halfway between 99 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=99 and Y=329.

To find the number halfway between 99 and 329, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 329 into our formula, we get:
(99 + 329)/2 = 214
Thus, the number halfway between 99 and 329 is 214.
To check that our answer is correct, we subtract 99 from 214 and subtract 214 from 329 and compare the two numbers:
214 - 99 = 115
329 - 214 = 115
As you can see, the halfway number is 115 higher than 99 and 115 lower than 329. Therefore, our halfway between answer of 214 above is correct.
Halfway Between
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Halfway Between 99 and 330
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