When you ask "What number is halfway between 23 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=23 and Y=640.
To find the number halfway between 23 and 640, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 23 and 640 into our formula, we get:
(23 + 640)/2 = 331.5
Thus, the number halfway between 23 and 640 is 331.5.
To check that our answer is correct, we subtract 23 from 331.5 and subtract 331.5 from 640 and compare the two numbers:
331.5 - 23 = 308.5
640 - 331.5 = 308.5
As you can see, the halfway number is 308.5 higher than 23 and 308.5 lower than 640. Therefore, our halfway between answer of 331.5 above is correct.
Halfway Between
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