When you ask "What number is halfway between 5 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=5 and Y=405.
To find the number halfway between 5 and 405, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 5 and 405 into our formula, we get:
(5 + 405)/2 = 205
Thus, the number halfway between 5 and 405 is 205.
To check that our answer is correct, we subtract 5 from 205 and subtract 205 from 405 and compare the two numbers:
205 - 5 = 200
405 - 205 = 200
As you can see, the halfway number is 200 higher than 5 and 200 lower than 405. Therefore, our halfway between answer of 205 above is correct.
Halfway Between
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Halfway Between 5 and 406
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