When you ask "What number is halfway between 18 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=18 and Y=408.
To find the number halfway between 18 and 408, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 408 into our formula, we get:
(18 + 408)/2 = 213
Thus, the number halfway between 18 and 408 is 213.
To check that our answer is correct, we subtract 18 from 213 and subtract 213 from 408 and compare the two numbers:
213 - 18 = 195
408 - 213 = 195
As you can see, the halfway number is 195 higher than 18 and 195 lower than 408. Therefore, our halfway between answer of 213 above is correct.
Halfway Between
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Halfway Between 18 and 409
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