When you ask "What number is halfway between 21 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=21 and Y=616.
To find the number halfway between 21 and 616, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 616 into our formula, we get:
(21 + 616)/2 = 318.5
Thus, the number halfway between 21 and 616 is 318.5.
To check that our answer is correct, we subtract 21 from 318.5 and subtract 318.5 from 616 and compare the two numbers:
318.5 - 21 = 297.5
616 - 318.5 = 297.5
As you can see, the halfway number is 297.5 higher than 21 and 297.5 lower than 616. Therefore, our halfway between answer of 318.5 above is correct.
Halfway Between
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Halfway Between 21 and 617
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