
When you ask "What number is halfway between 50 and 398?" 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=398.

To find the number halfway between 50 and 398, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 50 and 398 into our formula, we get:
(50 + 398)/2 = 224
Thus, the number halfway between 50 and 398 is 224.
To check that our answer is correct, we subtract 50 from 224 and subtract 224 from 398 and compare the two numbers:
224 - 50 = 174
398 - 224 = 174
As you can see, the halfway number is 174 higher than 50 and 174 lower than 398. Therefore, our halfway between answer of 224 above is correct.
Halfway Between
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Halfway Between 50 and 399
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