When you ask "What number is halfway between 100 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=100 and Y=819.
To find the number halfway between 100 and 819, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 819 into our formula, we get:
(100 + 819)/2 = 459.5
Thus, the number halfway between 100 and 819 is 459.5.
To check that our answer is correct, we subtract 100 from 459.5 and subtract 459.5 from 819 and compare the two numbers:
459.5 - 100 = 359.5
819 - 459.5 = 359.5
As you can see, the halfway number is 359.5 higher than 100 and 359.5 lower than 819. Therefore, our halfway between answer of 459.5 above is correct.
Halfway Between
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