When you ask "What number is halfway between 10 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=10 and Y=809.
To find the number halfway between 10 and 809, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 809 into our formula, we get:
(10 + 809)/2 = 409.5
Thus, the number halfway between 10 and 809 is 409.5.
To check that our answer is correct, we subtract 10 from 409.5 and subtract 409.5 from 809 and compare the two numbers:
409.5 - 10 = 399.5
809 - 409.5 = 399.5
As you can see, the halfway number is 399.5 higher than 10 and 399.5 lower than 809. Therefore, our halfway between answer of 409.5 above is correct.
Halfway Between
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Halfway Between 10 and 810
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