When you ask "What number is halfway between 7 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=7 and Y=398.
To find the number halfway between 7 and 398, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 398 into our formula, we get:
(7 + 398)/2 = 202.5
Thus, the number halfway between 7 and 398 is 202.5.
To check that our answer is correct, we subtract 7 from 202.5 and subtract 202.5 from 398 and compare the two numbers:
202.5 - 7 = 195.5
398 - 202.5 = 195.5
As you can see, the halfway number is 195.5 higher than 7 and 195.5 lower than 398. Therefore, our halfway between answer of 202.5 above is correct.
Halfway Between
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Halfway Between 7 and 399
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