When you ask "What number is halfway between 8 and 509?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=8 and Y=509.
To find the number halfway between 8 and 509, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 8 and 509 into our formula, we get:
(8 + 509)/2 = 258.5
Thus, the number halfway between 8 and 509 is 258.5.
To check that our answer is correct, we subtract 8 from 258.5 and subtract 258.5 from 509 and compare the two numbers:
258.5 - 8 = 250.5
509 - 258.5 = 250.5
As you can see, the halfway number is 250.5 higher than 8 and 250.5 lower than 509. Therefore, our halfway between answer of 258.5 above is correct.
Halfway Between
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Halfway Between 8 and 510
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