When you ask "What number is halfway between 15 and 624?" 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=624.
To find the number halfway between 15 and 624, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 624 into our formula, we get:
(15 + 624)/2 = 319.5
Thus, the number halfway between 15 and 624 is 319.5.
To check that our answer is correct, we subtract 15 from 319.5 and subtract 319.5 from 624 and compare the two numbers:
319.5 - 15 = 304.5
624 - 319.5 = 304.5
As you can see, the halfway number is 304.5 higher than 15 and 304.5 lower than 624. Therefore, our halfway between answer of 319.5 above is correct.
Halfway Between
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Halfway Between 15 and 625
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