When you ask "What number is halfway between 68 and 688?" 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=688.
To find the number halfway between 68 and 688, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 68 and 688 into our formula, we get:
(68 + 688)/2 = 378
Thus, the number halfway between 68 and 688 is 378.
To check that our answer is correct, we subtract 68 from 378 and subtract 378 from 688 and compare the two numbers:
378 - 68 = 310
688 - 378 = 310
As you can see, the halfway number is 310 higher than 68 and 310 lower than 688. Therefore, our halfway between answer of 378 above is correct.
Halfway Between
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