When you ask "What number is halfway between 64 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=64 and Y=81.
To find the number halfway between 64 and 81, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 64 and 81 into our formula, we get:
(64 + 81)/2 = 72.5
Thus, the number halfway between 64 and 81 is 72.5.
To check that our answer is correct, we subtract 64 from 72.5 and subtract 72.5 from 81 and compare the two numbers:
72.5 - 64 = 8.5
81 - 72.5 = 8.5
As you can see, the halfway number is 8.5 higher than 64 and 8.5 lower than 81. Therefore, our halfway between answer of 72.5 above is correct.
Halfway Between
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Halfway Between 64 and 82
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