When you ask "What number is halfway between 3 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=3 and Y=509.
To find the number halfway between 3 and 509, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 3 and 509 into our formula, we get:
(3 + 509)/2 = 256
Thus, the number halfway between 3 and 509 is 256.
To check that our answer is correct, we subtract 3 from 256 and subtract 256 from 509 and compare the two numbers:
256 - 3 = 253
509 - 256 = 253
As you can see, the halfway number is 253 higher than 3 and 253 lower than 509. Therefore, our halfway between answer of 256 above is correct.
Halfway Between
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Halfway Between 3 and 510
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