When you ask "What number is halfway between 10 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=10 and Y=509.
To find the number halfway between 10 and 509, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 509 into our formula, we get:
(10 + 509)/2 = 259.5
Thus, the number halfway between 10 and 509 is 259.5.
To check that our answer is correct, we subtract 10 from 259.5 and subtract 259.5 from 509 and compare the two numbers:
259.5 - 10 = 249.5
509 - 259.5 = 249.5
As you can see, the halfway number is 249.5 higher than 10 and 249.5 lower than 509. Therefore, our halfway between answer of 259.5 above is correct.
Halfway Between
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Halfway Between 10 and 510
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