When you ask "What number is halfway between 42 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=42 and Y=855.
To find the number halfway between 42 and 855, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 855 into our formula, we get:
(42 + 855)/2 = 448.5
Thus, the number halfway between 42 and 855 is 448.5.
To check that our answer is correct, we subtract 42 from 448.5 and subtract 448.5 from 855 and compare the two numbers:
448.5 - 42 = 406.5
855 - 448.5 = 406.5
As you can see, the halfway number is 406.5 higher than 42 and 406.5 lower than 855. Therefore, our halfway between answer of 448.5 above is correct.
Halfway Between
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Halfway Between 42 and 856
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