When you ask "What number is halfway between 100 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=100 and Y=329.
To find the number halfway between 100 and 329, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 329 into our formula, we get:
(100 + 329)/2 = 214.5
Thus, the number halfway between 100 and 329 is 214.5.
To check that our answer is correct, we subtract 100 from 214.5 and subtract 214.5 from 329 and compare the two numbers:
214.5 - 100 = 114.5
329 - 214.5 = 114.5
As you can see, the halfway number is 114.5 higher than 100 and 114.5 lower than 329. Therefore, our halfway between answer of 214.5 above is correct.
Halfway Between
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Halfway Between 100 and 330
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