When you ask "What number is halfway between 25 and 90?" 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=90.
To find the number halfway between 25 and 90, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 90 into our formula, we get:
(25 + 90)/2 = 57.5
Thus, the number halfway between 25 and 90 is 57.5.
To check that our answer is correct, we subtract 25 from 57.5 and subtract 57.5 from 90 and compare the two numbers:
57.5 - 25 = 32.5
90 - 57.5 = 32.5
As you can see, the halfway number is 32.5 higher than 25 and 32.5 lower than 90. Therefore, our halfway between answer of 57.5 above is correct.
Halfway Between
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Halfway Between 25 and 91
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