When you ask "What number is halfway between 15 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=15 and Y=604.
To find the number halfway between 15 and 604, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 604 into our formula, we get:
(15 + 604)/2 = 309.5
Thus, the number halfway between 15 and 604 is 309.5.
To check that our answer is correct, we subtract 15 from 309.5 and subtract 309.5 from 604 and compare the two numbers:
309.5 - 15 = 294.5
604 - 309.5 = 294.5
As you can see, the halfway number is 294.5 higher than 15 and 294.5 lower than 604. Therefore, our halfway between answer of 309.5 above is correct.
Halfway Between
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Halfway Between 15 and 605
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