When you ask "What number is halfway between 9 and 604?" 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=604.
To find the number halfway between 9 and 604, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 604 into our formula, we get:
(9 + 604)/2 = 306.5
Thus, the number halfway between 9 and 604 is 306.5.
To check that our answer is correct, we subtract 9 from 306.5 and subtract 306.5 from 604 and compare the two numbers:
306.5 - 9 = 297.5
604 - 306.5 = 297.5
As you can see, the halfway number is 297.5 higher than 9 and 297.5 lower than 604. Therefore, our halfway between answer of 306.5 above is correct.
Halfway Between
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