When you ask "What number is halfway between 51 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=51 and Y=398.
To find the number halfway between 51 and 398, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 398 into our formula, we get:
(51 + 398)/2 = 224.5
Thus, the number halfway between 51 and 398 is 224.5.
To check that our answer is correct, we subtract 51 from 224.5 and subtract 224.5 from 398 and compare the two numbers:
224.5 - 51 = 173.5
398 - 224.5 = 173.5
As you can see, the halfway number is 173.5 higher than 51 and 173.5 lower than 398. Therefore, our halfway between answer of 224.5 above is correct.
Halfway Between
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Halfway Between 51 and 399
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