When you ask "What number is halfway between 50 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=50 and Y=81.
To find the number halfway between 50 and 81, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 50 and 81 into our formula, we get:
(50 + 81)/2 = 65.5
Thus, the number halfway between 50 and 81 is 65.5.
To check that our answer is correct, we subtract 50 from 65.5 and subtract 65.5 from 81 and compare the two numbers:
65.5 - 50 = 15.5
81 - 65.5 = 15.5
As you can see, the halfway number is 15.5 higher than 50 and 15.5 lower than 81. Therefore, our halfway between answer of 65.5 above is correct.
Halfway Between
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Halfway Between 50 and 82
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