When you ask "What number is halfway between 13 and 822?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=13 and Y=822.
To find the number halfway between 13 and 822, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 13 and 822 into our formula, we get:
(13 + 822)/2 = 417.5
Thus, the number halfway between 13 and 822 is 417.5.
To check that our answer is correct, we subtract 13 from 417.5 and subtract 417.5 from 822 and compare the two numbers:
417.5 - 13 = 404.5
822 - 417.5 = 404.5
As you can see, the halfway number is 404.5 higher than 13 and 404.5 lower than 822. Therefore, our halfway between answer of 417.5 above is correct.
Halfway Between
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Halfway Between 13 and 823
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