When you ask "What number is halfway between 21 and 618?" 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=618.
To find the number halfway between 21 and 618, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 618 into our formula, we get:
(21 + 618)/2 = 319.5
Thus, the number halfway between 21 and 618 is 319.5.
To check that our answer is correct, we subtract 21 from 319.5 and subtract 319.5 from 618 and compare the two numbers:
319.5 - 21 = 298.5
618 - 319.5 = 298.5
As you can see, the halfway number is 298.5 higher than 21 and 298.5 lower than 618. Therefore, our halfway between answer of 319.5 above is correct.
Halfway Between
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Halfway Between 21 and 619
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