When you ask "What number is halfway between 15 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=15 and Y=640.
To find the number halfway between 15 and 640, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 640 into our formula, we get:
(15 + 640)/2 = 327.5
Thus, the number halfway between 15 and 640 is 327.5.
To check that our answer is correct, we subtract 15 from 327.5 and subtract 327.5 from 640 and compare the two numbers:
327.5 - 15 = 312.5
640 - 327.5 = 312.5
As you can see, the halfway number is 312.5 higher than 15 and 312.5 lower than 640. Therefore, our halfway between answer of 327.5 above is correct.
Halfway Between
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