When you ask "What number is halfway between 20 and 405?" 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=405.
To find the number halfway between 20 and 405, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 405 into our formula, we get:
(20 + 405)/2 = 212.5
Thus, the number halfway between 20 and 405 is 212.5.
To check that our answer is correct, we subtract 20 from 212.5 and subtract 212.5 from 405 and compare the two numbers:
212.5 - 20 = 192.5
405 - 212.5 = 192.5
As you can see, the halfway number is 192.5 higher than 20 and 192.5 lower than 405. Therefore, our halfway between answer of 212.5 above is correct.
Halfway Between
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Halfway Between 20 and 406
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