When you ask "What number is halfway between 11 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=11 and Y=640.
To find the number halfway between 11 and 640, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 640 into our formula, we get:
(11 + 640)/2 = 325.5
Thus, the number halfway between 11 and 640 is 325.5.
To check that our answer is correct, we subtract 11 from 325.5 and subtract 325.5 from 640 and compare the two numbers:
325.5 - 11 = 314.5
640 - 325.5 = 314.5
As you can see, the halfway number is 314.5 higher than 11 and 314.5 lower than 640. Therefore, our halfway between answer of 325.5 above is correct.
Halfway Between
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