When you ask "What number is halfway between 28 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=28 and Y=509.
To find the number halfway between 28 and 509, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 28 and 509 into our formula, we get:
(28 + 509)/2 = 268.5
Thus, the number halfway between 28 and 509 is 268.5.
To check that our answer is correct, we subtract 28 from 268.5 and subtract 268.5 from 509 and compare the two numbers:
268.5 - 28 = 240.5
509 - 268.5 = 240.5
As you can see, the halfway number is 240.5 higher than 28 and 240.5 lower than 509. Therefore, our halfway between answer of 268.5 above is correct.
Halfway Between
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Halfway Between 28 and 510
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