When you ask "What number is halfway between 18 and 641?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=18 and Y=641.
To find the number halfway between 18 and 641, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 641 into our formula, we get:
(18 + 641)/2 = 329.5
Thus, the number halfway between 18 and 641 is 329.5.
To check that our answer is correct, we subtract 18 from 329.5 and subtract 329.5 from 641 and compare the two numbers:
329.5 - 18 = 311.5
641 - 329.5 = 311.5
As you can see, the halfway number is 311.5 higher than 18 and 311.5 lower than 641. Therefore, our halfway between answer of 329.5 above is correct.
Halfway Between
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Halfway Between 18 and 642
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