When you ask "What number is halfway between 100 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=100 and Y=641.
To find the number halfway between 100 and 641, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 641 into our formula, we get:
(100 + 641)/2 = 370.5
Thus, the number halfway between 100 and 641 is 370.5.
To check that our answer is correct, we subtract 100 from 370.5 and subtract 370.5 from 641 and compare the two numbers:
370.5 - 100 = 270.5
641 - 370.5 = 270.5
As you can see, the halfway number is 270.5 higher than 100 and 270.5 lower than 641. Therefore, our halfway between answer of 370.5 above is correct.
Halfway Between
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Halfway Between 100 and 642
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