When you ask "What number is halfway between 42 and 827?" 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=827.
To find the number halfway between 42 and 827, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 827 into our formula, we get:
(42 + 827)/2 = 434.5
Thus, the number halfway between 42 and 827 is 434.5.
To check that our answer is correct, we subtract 42 from 434.5 and subtract 434.5 from 827 and compare the two numbers:
434.5 - 42 = 392.5
827 - 434.5 = 392.5
As you can see, the halfway number is 392.5 higher than 42 and 392.5 lower than 827. Therefore, our halfway between answer of 434.5 above is correct.
Halfway Between
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Halfway Between 42 and 828
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