When you ask "What number is halfway between 42 and 819?" 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=819.
To find the number halfway between 42 and 819, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 819 into our formula, we get:
(42 + 819)/2 = 430.5
Thus, the number halfway between 42 and 819 is 430.5.
To check that our answer is correct, we subtract 42 from 430.5 and subtract 430.5 from 819 and compare the two numbers:
430.5 - 42 = 388.5
819 - 430.5 = 388.5
As you can see, the halfway number is 388.5 higher than 42 and 388.5 lower than 819. Therefore, our halfway between answer of 430.5 above is correct.
Halfway Between
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Halfway Between 42 and 820
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