When you ask "What number is halfway between 25 and 109?" 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=109.
To find the number halfway between 25 and 109, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 109 into our formula, we get:
(25 + 109)/2 = 67
Thus, the number halfway between 25 and 109 is 67.
To check that our answer is correct, we subtract 25 from 67 and subtract 67 from 109 and compare the two numbers:
67 - 25 = 42
109 - 67 = 42
As you can see, the halfway number is 42 higher than 25 and 42 lower than 109. Therefore, our halfway between answer of 67 above is correct.
Halfway Between
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Halfway Between 25 and 110
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