When you ask "What number is halfway between 20 and 817?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=20 and Y=817.
To find the number halfway between 20 and 817, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 817 into our formula, we get:
(20 + 817)/2 = 418.5
Thus, the number halfway between 20 and 817 is 418.5.
To check that our answer is correct, we subtract 20 from 418.5 and subtract 418.5 from 817 and compare the two numbers:
418.5 - 20 = 398.5
817 - 418.5 = 398.5
As you can see, the halfway number is 398.5 higher than 20 and 398.5 lower than 817. Therefore, our halfway between answer of 418.5 above is correct.
Halfway Between
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Halfway Between 20 and 818
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