When you ask "What number is halfway between 25 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=25 and Y=128.
To find the number halfway between 25 and 128, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 128 into our formula, we get:
(25 + 128)/2 = 76.5
Thus, the number halfway between 25 and 128 is 76.5.
To check that our answer is correct, we subtract 25 from 76.5 and subtract 76.5 from 128 and compare the two numbers:
76.5 - 25 = 51.5
128 - 76.5 = 51.5
As you can see, the halfway number is 51.5 higher than 25 and 51.5 lower than 128. Therefore, our halfway between answer of 76.5 above is correct.
Halfway Between
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Halfway Between 25 and 129
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