When you ask "What number is halfway between 55 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=55 and Y=398.
To find the number halfway between 55 and 398, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 398 into our formula, we get:
(55 + 398)/2 = 226.5
Thus, the number halfway between 55 and 398 is 226.5.
To check that our answer is correct, we subtract 55 from 226.5 and subtract 226.5 from 398 and compare the two numbers:
226.5 - 55 = 171.5
398 - 226.5 = 171.5
As you can see, the halfway number is 171.5 higher than 55 and 171.5 lower than 398. Therefore, our halfway between answer of 226.5 above is correct.
Halfway Between
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Halfway Between 55 and 399
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