When you ask "What number is halfway between 0 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=0 and Y=81.
To find the number halfway between 0 and 81, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 0 and 81 into our formula, we get:
(0 + 81)/2 = 40.5
Thus, the number halfway between 0 and 81 is 40.5.
To check that our answer is correct, we subtract 0 from 40.5 and subtract 40.5 from 81 and compare the two numbers:
40.5 - 0 = 40.5
81 - 40.5 = 40.5
As you can see, the halfway number is 40.5 higher than 0 and 40.5 lower than 81. Therefore, our halfway between answer of 40.5 above is correct.
Halfway Between
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Halfway Between 0 and 82
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