When you ask "What number is halfway between 100 and 855?" 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=855.
To find the number halfway between 100 and 855, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 855 into our formula, we get:
(100 + 855)/2 = 477.5
Thus, the number halfway between 100 and 855 is 477.5.
To check that our answer is correct, we subtract 100 from 477.5 and subtract 477.5 from 855 and compare the two numbers:
477.5 - 100 = 377.5
855 - 477.5 = 377.5
As you can see, the halfway number is 377.5 higher than 100 and 377.5 lower than 855. Therefore, our halfway between answer of 477.5 above is correct.
Halfway Between
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Halfway Between 100 and 856
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