When you ask "What number is halfway between 30 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=30 and Y=405.
To find the number halfway between 30 and 405, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 405 into our formula, we get:
(30 + 405)/2 = 217.5
Thus, the number halfway between 30 and 405 is 217.5.
To check that our answer is correct, we subtract 30 from 217.5 and subtract 217.5 from 405 and compare the two numbers:
217.5 - 30 = 187.5
405 - 217.5 = 187.5
As you can see, the halfway number is 187.5 higher than 30 and 187.5 lower than 405. Therefore, our halfway between answer of 217.5 above is correct.
Halfway Between
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Halfway Between 30 and 406
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