When you ask "What number is halfway between 99 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=99 and Y=668.
To find the number halfway between 99 and 668, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 668 into our formula, we get:
(99 + 668)/2 = 383.5
Thus, the number halfway between 99 and 668 is 383.5.
To check that our answer is correct, we subtract 99 from 383.5 and subtract 383.5 from 668 and compare the two numbers:
383.5 - 99 = 284.5
668 - 383.5 = 284.5
As you can see, the halfway number is 284.5 higher than 99 and 284.5 lower than 668. Therefore, our halfway between answer of 383.5 above is correct.
Halfway Between
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