When you ask "What number is halfway between 25 and 198?" 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=198.
To find the number halfway between 25 and 198, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 198 into our formula, we get:
(25 + 198)/2 = 111.5
Thus, the number halfway between 25 and 198 is 111.5.
To check that our answer is correct, we subtract 25 from 111.5 and subtract 111.5 from 198 and compare the two numbers:
111.5 - 25 = 86.5
198 - 111.5 = 86.5
As you can see, the halfway number is 86.5 higher than 25 and 86.5 lower than 198. Therefore, our halfway between answer of 111.5 above is correct.
Halfway Between
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Halfway Between 25 and 199
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