When you ask "What number is halfway between 15 and 724?" 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=724.
To find the number halfway between 15 and 724, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 724 into our formula, we get:
(15 + 724)/2 = 369.5
Thus, the number halfway between 15 and 724 is 369.5.
To check that our answer is correct, we subtract 15 from 369.5 and subtract 369.5 from 724 and compare the two numbers:
369.5 - 15 = 354.5
724 - 369.5 = 354.5
As you can see, the halfway number is 354.5 higher than 15 and 354.5 lower than 724. Therefore, our halfway between answer of 369.5 above is correct.
Halfway Between
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Halfway Between 15 and 725
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