When you ask "What number is halfway between 81 and 908?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=81 and Y=908.
To find the number halfway between 81 and 908, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 908 into our formula, we get:
(81 + 908)/2 = 494.5
Thus, the number halfway between 81 and 908 is 494.5.
To check that our answer is correct, we subtract 81 from 494.5 and subtract 494.5 from 908 and compare the two numbers:
494.5 - 81 = 413.5
908 - 494.5 = 413.5
As you can see, the halfway number is 413.5 higher than 81 and 413.5 lower than 908. Therefore, our halfway between answer of 494.5 above is correct.
Halfway Between
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Halfway Between 81 and 909
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