When you ask "What number is halfway between 15 and 616?" 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=616.
To find the number halfway between 15 and 616, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 616 into our formula, we get:
(15 + 616)/2 = 315.5
Thus, the number halfway between 15 and 616 is 315.5.
To check that our answer is correct, we subtract 15 from 315.5 and subtract 315.5 from 616 and compare the two numbers:
315.5 - 15 = 300.5
616 - 315.5 = 300.5
As you can see, the halfway number is 300.5 higher than 15 and 300.5 lower than 616. Therefore, our halfway between answer of 315.5 above is correct.
Halfway Between
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Halfway Between 15 and 617
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