When you ask "What number is halfway between 100 and 909?" 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=909.
To find the number halfway between 100 and 909, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 909 into our formula, we get:
(100 + 909)/2 = 504.5
Thus, the number halfway between 100 and 909 is 504.5.
To check that our answer is correct, we subtract 100 from 504.5 and subtract 504.5 from 909 and compare the two numbers:
504.5 - 100 = 404.5
909 - 504.5 = 404.5
As you can see, the halfway number is 404.5 higher than 100 and 404.5 lower than 909. Therefore, our halfway between answer of 504.5 above is correct.
Halfway Between
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Halfway Between 100 and 910
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