When you ask "What number is halfway between 22 and 819?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=22 and Y=819.
To find the number halfway between 22 and 819, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 22 and 819 into our formula, we get:
(22 + 819)/2 = 420.5
Thus, the number halfway between 22 and 819 is 420.5.
To check that our answer is correct, we subtract 22 from 420.5 and subtract 420.5 from 819 and compare the two numbers:
420.5 - 22 = 398.5
819 - 420.5 = 398.5
As you can see, the halfway number is 398.5 higher than 22 and 398.5 lower than 819. Therefore, our halfway between answer of 420.5 above is correct.
Halfway Between
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