When you ask "What number is halfway between 18 and 409?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=18 and Y=409.
To find the number halfway between 18 and 409, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 409 into our formula, we get:
(18 + 409)/2 = 213.5
Thus, the number halfway between 18 and 409 is 213.5.
To check that our answer is correct, we subtract 18 from 213.5 and subtract 213.5 from 409 and compare the two numbers:
213.5 - 18 = 195.5
409 - 213.5 = 195.5
As you can see, the halfway number is 195.5 higher than 18 and 195.5 lower than 409. Therefore, our halfway between answer of 213.5 above is correct.
Halfway Between
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Halfway Between 18 and 410
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