When you ask "What number is halfway between 9 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=9 and Y=405.
To find the number halfway between 9 and 405, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 405 into our formula, we get:
(9 + 405)/2 = 207
Thus, the number halfway between 9 and 405 is 207.
To check that our answer is correct, we subtract 9 from 207 and subtract 207 from 405 and compare the two numbers:
207 - 9 = 198
405 - 207 = 198
As you can see, the halfway number is 198 higher than 9 and 198 lower than 405. Therefore, our halfway between answer of 207 above is correct.
Halfway Between
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Halfway Between 9 and 406
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