When you ask "What number is halfway between 15 and 578?" 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=578.
To find the number halfway between 15 and 578, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 578 into our formula, we get:
(15 + 578)/2 = 296.5
Thus, the number halfway between 15 and 578 is 296.5.
To check that our answer is correct, we subtract 15 from 296.5 and subtract 296.5 from 578 and compare the two numbers:
296.5 - 15 = 281.5
578 - 296.5 = 281.5
As you can see, the halfway number is 281.5 higher than 15 and 281.5 lower than 578. Therefore, our halfway between answer of 296.5 above is correct.
Halfway Between
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Halfway Between 15 and 579
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