When you ask "What number is halfway between 25 and 100?" 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=100.
To find the number halfway between 25 and 100, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 100 into our formula, we get:
(25 + 100)/2 = 62.5
Thus, the number halfway between 25 and 100 is 62.5.
To check that our answer is correct, we subtract 25 from 62.5 and subtract 62.5 from 100 and compare the two numbers:
62.5 - 25 = 37.5
100 - 62.5 = 37.5
As you can see, the halfway number is 37.5 higher than 25 and 37.5 lower than 100. Therefore, our halfway between answer of 62.5 above is correct.
Halfway Between
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Halfway Between 25 and 101
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