When you ask "What number is halfway between 9 and 564?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=9 and Y=564.
To find the number halfway between 9 and 564, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 564 into our formula, we get:
(9 + 564)/2 = 286.5
Thus, the number halfway between 9 and 564 is 286.5.
To check that our answer is correct, we subtract 9 from 286.5 and subtract 286.5 from 564 and compare the two numbers:
286.5 - 9 = 277.5
564 - 286.5 = 277.5
As you can see, the halfway number is 277.5 higher than 9 and 277.5 lower than 564. Therefore, our halfway between answer of 286.5 above is correct.
Halfway Between
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Halfway Between 9 and 565
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