When you ask "What number is halfway between 40 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=40 and Y=405.
To find the number halfway between 40 and 405, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 40 and 405 into our formula, we get:
(40 + 405)/2 = 222.5
Thus, the number halfway between 40 and 405 is 222.5.
To check that our answer is correct, we subtract 40 from 222.5 and subtract 222.5 from 405 and compare the two numbers:
222.5 - 40 = 182.5
405 - 222.5 = 182.5
As you can see, the halfway number is 182.5 higher than 40 and 182.5 lower than 405. Therefore, our halfway between answer of 222.5 above is correct.
Halfway Between
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Halfway Between 40 and 406
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