When you ask "What number is halfway between 17 and 408?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=17 and Y=408.
To find the number halfway between 17 and 408, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 408 into our formula, we get:
(17 + 408)/2 = 212.5
Thus, the number halfway between 17 and 408 is 212.5.
To check that our answer is correct, we subtract 17 from 212.5 and subtract 212.5 from 408 and compare the two numbers:
212.5 - 17 = 195.5
408 - 212.5 = 195.5
As you can see, the halfway number is 195.5 higher than 17 and 195.5 lower than 408. Therefore, our halfway between answer of 212.5 above is correct.
Halfway Between
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Halfway Between 17 and 409
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