When you ask "What number is halfway between 8 and 251?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=8 and Y=251.
To find the number halfway between 8 and 251, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 8 and 251 into our formula, we get:
(8 + 251)/2 = 129.5
Thus, the number halfway between 8 and 251 is 129.5.
To check that our answer is correct, we subtract 8 from 129.5 and subtract 129.5 from 251 and compare the two numbers:
129.5 - 8 = 121.5
251 - 129.5 = 121.5
As you can see, the halfway number is 121.5 higher than 8 and 121.5 lower than 251. Therefore, our halfway between answer of 129.5 above is correct.
Halfway Between
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Halfway Between 8 and 252
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