When you ask "What number is halfway between 81 and 838?" 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=838.
To find the number halfway between 81 and 838, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 838 into our formula, we get:
(81 + 838)/2 = 459.5
Thus, the number halfway between 81 and 838 is 459.5.
To check that our answer is correct, we subtract 81 from 459.5 and subtract 459.5 from 838 and compare the two numbers:
459.5 - 81 = 378.5
838 - 459.5 = 378.5
As you can see, the halfway number is 378.5 higher than 81 and 378.5 lower than 838. Therefore, our halfway between answer of 459.5 above is correct.
Halfway Between
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Halfway Between 81 and 839
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