When you ask "What number is halfway between 9 and 248?" 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=248.
To find the number halfway between 9 and 248, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 248 into our formula, we get:
(9 + 248)/2 = 128.5
Thus, the number halfway between 9 and 248 is 128.5.
To check that our answer is correct, we subtract 9 from 128.5 and subtract 128.5 from 248 and compare the two numbers:
128.5 - 9 = 119.5
248 - 128.5 = 119.5
As you can see, the halfway number is 119.5 higher than 9 and 119.5 lower than 248. Therefore, our halfway between answer of 128.5 above is correct.
Halfway Between
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Halfway Between 9 and 249
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