When you ask "What number is halfway between 68 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=68 and Y=668.
To find the number halfway between 68 and 668, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 68 and 668 into our formula, we get:
(68 + 668)/2 = 368
Thus, the number halfway between 68 and 668 is 368.
To check that our answer is correct, we subtract 68 from 368 and subtract 368 from 668 and compare the two numbers:
368 - 68 = 300
668 - 368 = 300
As you can see, the halfway number is 300 higher than 68 and 300 lower than 668. Therefore, our halfway between answer of 368 above is correct.
Halfway Between
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