When you ask "What number is halfway between 4 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=4 and Y=509.
To find the number halfway between 4 and 509, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 509 into our formula, we get:
(4 + 509)/2 = 256.5
Thus, the number halfway between 4 and 509 is 256.5.
To check that our answer is correct, we subtract 4 from 256.5 and subtract 256.5 from 509 and compare the two numbers:
256.5 - 4 = 252.5
509 - 256.5 = 252.5
As you can see, the halfway number is 252.5 higher than 4 and 252.5 lower than 509. Therefore, our halfway between answer of 256.5 above is correct.
Halfway Between
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Halfway Between 4 and 510
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