When you ask "What number is halfway between 10 and 25?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=10 and Y=25.
To find the number halfway between 10 and 25, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 25 into our formula, we get:
(10 + 25)/2 = 17.5
Thus, the number halfway between 10 and 25 is 17.5.
To check that our answer is correct, we subtract 10 from 17.5 and subtract 17.5 from 25 and compare the two numbers:
17.5 - 10 = 7.5
25 - 17.5 = 7.5
As you can see, the halfway number is 7.5 higher than 10 and 7.5 lower than 25. Therefore, our halfway between answer of 17.5 above is correct.
Halfway Between
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