When you ask "What number is halfway between 18 and 621?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=18 and Y=621.
To find the number halfway between 18 and 621, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 621 into our formula, we get:
(18 + 621)/2 = 319.5
Thus, the number halfway between 18 and 621 is 319.5.
To check that our answer is correct, we subtract 18 from 319.5 and subtract 319.5 from 621 and compare the two numbers:
319.5 - 18 = 301.5
621 - 319.5 = 301.5
As you can see, the halfway number is 301.5 higher than 18 and 301.5 lower than 621. Therefore, our halfway between answer of 319.5 above is correct.
Halfway Between
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Halfway Between 18 and 622
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