When you ask "What number is halfway between 30 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=30 and Y=823.
To find the number halfway between 30 and 823, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 823 into our formula, we get:
(30 + 823)/2 = 426.5
Thus, the number halfway between 30 and 823 is 426.5.
To check that our answer is correct, we subtract 30 from 426.5 and subtract 426.5 from 823 and compare the two numbers:
426.5 - 30 = 396.5
823 - 426.5 = 396.5
As you can see, the halfway number is 396.5 higher than 30 and 396.5 lower than 823. Therefore, our halfway between answer of 426.5 above is correct.
Halfway Between
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Halfway Between 30 and 824
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