When you ask "What number is halfway between 42 and 871?" 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=871.
To find the number halfway between 42 and 871, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 871 into our formula, we get:
(42 + 871)/2 = 456.5
Thus, the number halfway between 42 and 871 is 456.5.
To check that our answer is correct, we subtract 42 from 456.5 and subtract 456.5 from 871 and compare the two numbers:
456.5 - 42 = 414.5
871 - 456.5 = 414.5
As you can see, the halfway number is 414.5 higher than 42 and 414.5 lower than 871. Therefore, our halfway between answer of 456.5 above is correct.
Halfway Between
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Halfway Between 42 and 872
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