When you ask "What number is halfway between 11 and 668?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=11 and Y=668.
To find the number halfway between 11 and 668, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 668 into our formula, we get:
(11 + 668)/2 = 339.5
Thus, the number halfway between 11 and 668 is 339.5.
To check that our answer is correct, we subtract 11 from 339.5 and subtract 339.5 from 668 and compare the two numbers:
339.5 - 11 = 328.5
668 - 339.5 = 328.5
As you can see, the halfway number is 328.5 higher than 11 and 328.5 lower than 668. Therefore, our halfway between answer of 339.5 above is correct.
Halfway Between
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Halfway Between 11 and 669
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