When you ask "What number is halfway between 81 and 128?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=81 and Y=128.
To find the number halfway between 81 and 128, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 128 into our formula, we get:
(81 + 128)/2 = 104.5
Thus, the number halfway between 81 and 128 is 104.5.
To check that our answer is correct, we subtract 81 from 104.5 and subtract 104.5 from 128 and compare the two numbers:
104.5 - 81 = 23.5
128 - 104.5 = 23.5
As you can see, the halfway number is 23.5 higher than 81 and 23.5 lower than 128. Therefore, our halfway between answer of 104.5 above is correct.
Halfway Between
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Halfway Between 81 and 129
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