When you ask "What number is halfway between 30 and 817?" 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=817.
To find the number halfway between 30 and 817, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 817 into our formula, we get:
(30 + 817)/2 = 423.5
Thus, the number halfway between 30 and 817 is 423.5.
To check that our answer is correct, we subtract 30 from 423.5 and subtract 423.5 from 817 and compare the two numbers:
423.5 - 30 = 393.5
817 - 423.5 = 393.5
As you can see, the halfway number is 393.5 higher than 30 and 393.5 lower than 817. Therefore, our halfway between answer of 423.5 above is correct.
Halfway Between
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Halfway Between 30 and 818
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