When you ask "What number is halfway between 12 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=12 and Y=509.
To find the number halfway between 12 and 509, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 509 into our formula, we get:
(12 + 509)/2 = 260.5
Thus, the number halfway between 12 and 509 is 260.5.
To check that our answer is correct, we subtract 12 from 260.5 and subtract 260.5 from 509 and compare the two numbers:
260.5 - 12 = 248.5
509 - 260.5 = 248.5
As you can see, the halfway number is 248.5 higher than 12 and 248.5 lower than 509. Therefore, our halfway between answer of 260.5 above is correct.
Halfway Between
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Halfway Between 12 and 510
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