When you ask "What number is halfway between 54 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=54 and Y=81.
To find the number halfway between 54 and 81, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 54 and 81 into our formula, we get:
(54 + 81)/2 = 67.5
Thus, the number halfway between 54 and 81 is 67.5.
To check that our answer is correct, we subtract 54 from 67.5 and subtract 67.5 from 81 and compare the two numbers:
67.5 - 54 = 13.5
81 - 67.5 = 13.5
As you can see, the halfway number is 13.5 higher than 54 and 13.5 lower than 81. Therefore, our halfway between answer of 67.5 above is correct.
Halfway Between
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Halfway Between 54 and 82
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