When you ask "What number is halfway between 30 and 809?" 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=809.
To find the number halfway between 30 and 809, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 809 into our formula, we get:
(30 + 809)/2 = 419.5
Thus, the number halfway between 30 and 809 is 419.5.
To check that our answer is correct, we subtract 30 from 419.5 and subtract 419.5 from 809 and compare the two numbers:
419.5 - 30 = 389.5
809 - 419.5 = 389.5
As you can see, the halfway number is 389.5 higher than 30 and 389.5 lower than 809. Therefore, our halfway between answer of 419.5 above is correct.
Halfway Between
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Halfway Between 30 and 810
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