When you ask "What number is halfway between 16 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=16 and Y=405.
To find the number halfway between 16 and 405, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 16 and 405 into our formula, we get:
(16 + 405)/2 = 210.5
Thus, the number halfway between 16 and 405 is 210.5.
To check that our answer is correct, we subtract 16 from 210.5 and subtract 210.5 from 405 and compare the two numbers:
210.5 - 16 = 194.5
405 - 210.5 = 194.5
As you can see, the halfway number is 194.5 higher than 16 and 194.5 lower than 405. Therefore, our halfway between answer of 210.5 above is correct.
Halfway Between
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Halfway Between 16 and 406
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