
When you ask "What number is halfway between 50 and 321?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=50 and Y=321.

To find the number halfway between 50 and 321, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 50 and 321 into our formula, we get:
(50 + 321)/2 = 185.5
Thus, the number halfway between 50 and 321 is 185.5.
To check that our answer is correct, we subtract 50 from 185.5 and subtract 185.5 from 321 and compare the two numbers:
185.5 - 50 = 135.5
321 - 185.5 = 135.5
As you can see, the halfway number is 135.5 higher than 50 and 135.5 lower than 321. Therefore, our halfway between answer of 185.5 above is correct.
Halfway Between
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Halfway Between 50 and 322
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