When you ask "What number is halfway between 25 and 122?" 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=122.
To find the number halfway between 25 and 122, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 122 into our formula, we get:
(25 + 122)/2 = 73.5
Thus, the number halfway between 25 and 122 is 73.5.
To check that our answer is correct, we subtract 25 from 73.5 and subtract 73.5 from 122 and compare the two numbers:
73.5 - 25 = 48.5
122 - 73.5 = 48.5
As you can see, the halfway number is 48.5 higher than 25 and 48.5 lower than 122. Therefore, our halfway between answer of 73.5 above is correct.
Halfway Between
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Halfway Between 25 and 123
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