When you ask "What number is halfway between 20 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=20 and Y=329.
To find the number halfway between 20 and 329, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 329 into our formula, we get:
(20 + 329)/2 = 174.5
Thus, the number halfway between 20 and 329 is 174.5.
To check that our answer is correct, we subtract 20 from 174.5 and subtract 174.5 from 329 and compare the two numbers:
174.5 - 20 = 154.5
329 - 174.5 = 154.5
As you can see, the halfway number is 154.5 higher than 20 and 154.5 lower than 329. Therefore, our halfway between answer of 174.5 above is correct.
Halfway Between
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Halfway Between 20 and 330
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