When you ask "What number is halfway between 25 and 660?" 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=660.
To find the number halfway between 25 and 660, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 660 into our formula, we get:
(25 + 660)/2 = 342.5
Thus, the number halfway between 25 and 660 is 342.5.
To check that our answer is correct, we subtract 25 from 342.5 and subtract 342.5 from 660 and compare the two numbers:
342.5 - 25 = 317.5
660 - 342.5 = 317.5
As you can see, the halfway number is 317.5 higher than 25 and 317.5 lower than 660. Therefore, our halfway between answer of 342.5 above is correct.
Halfway Between
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