When you ask "What number is halfway between 9 and 396?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=9 and Y=396.
To find the number halfway between 9 and 396, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 396 into our formula, we get:
(9 + 396)/2 = 202.5
Thus, the number halfway between 9 and 396 is 202.5.
To check that our answer is correct, we subtract 9 from 202.5 and subtract 202.5 from 396 and compare the two numbers:
202.5 - 9 = 193.5
396 - 202.5 = 193.5
As you can see, the halfway number is 193.5 higher than 9 and 193.5 lower than 396. Therefore, our halfway between answer of 202.5 above is correct.
Halfway Between
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Halfway Between 9 and 397
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