When you ask "What number is halfway between 25 and 640?" 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=640.
To find the number halfway between 25 and 640, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 640 into our formula, we get:
(25 + 640)/2 = 332.5
Thus, the number halfway between 25 and 640 is 332.5.
To check that our answer is correct, we subtract 25 from 332.5 and subtract 332.5 from 640 and compare the two numbers:
332.5 - 25 = 307.5
640 - 332.5 = 307.5
As you can see, the halfway number is 307.5 higher than 25 and 307.5 lower than 640. Therefore, our halfway between answer of 332.5 above is correct.
Halfway Between
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