When you ask "What number is halfway between 2 and 81?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=2 and Y=81.
To find the number halfway between 2 and 81, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 2 and 81 into our formula, we get:
(2 + 81)/2 = 41.5
Thus, the number halfway between 2 and 81 is 41.5.
To check that our answer is correct, we subtract 2 from 41.5 and subtract 41.5 from 81 and compare the two numbers:
41.5 - 2 = 39.5
81 - 41.5 = 39.5
As you can see, the halfway number is 39.5 higher than 2 and 39.5 lower than 81. Therefore, our halfway between answer of 41.5 above is correct.
Halfway Between
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Halfway Between 2 and 82
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