When you ask "What number is halfway between 42 and 823?" 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=823.
To find the number halfway between 42 and 823, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 823 into our formula, we get:
(42 + 823)/2 = 432.5
Thus, the number halfway between 42 and 823 is 432.5.
To check that our answer is correct, we subtract 42 from 432.5 and subtract 432.5 from 823 and compare the two numbers:
432.5 - 42 = 390.5
823 - 432.5 = 390.5
As you can see, the halfway number is 390.5 higher than 42 and 390.5 lower than 823. Therefore, our halfway between answer of 432.5 above is correct.
Halfway Between
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Halfway Between 42 and 824
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