When you ask "What number is halfway between 42 and 815?" 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=815.
To find the number halfway between 42 and 815, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 815 into our formula, we get:
(42 + 815)/2 = 428.5
Thus, the number halfway between 42 and 815 is 428.5.
To check that our answer is correct, we subtract 42 from 428.5 and subtract 428.5 from 815 and compare the two numbers:
428.5 - 42 = 386.5
815 - 428.5 = 386.5
As you can see, the halfway number is 386.5 higher than 42 and 386.5 lower than 815. Therefore, our halfway between answer of 428.5 above is correct.
Halfway Between
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Halfway Between 42 and 816
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