When you ask "What number is halfway between 12 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=12 and Y=817.
To find the number halfway between 12 and 817, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 817 into our formula, we get:
(12 + 817)/2 = 414.5
Thus, the number halfway between 12 and 817 is 414.5.
To check that our answer is correct, we subtract 12 from 414.5 and subtract 414.5 from 817 and compare the two numbers:
414.5 - 12 = 402.5
817 - 414.5 = 402.5
As you can see, the halfway number is 402.5 higher than 12 and 402.5 lower than 817. Therefore, our halfway between answer of 414.5 above is correct.
Halfway Between
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Halfway Between 12 and 818
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