When you ask "What number is halfway between 23 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=23 and Y=688.
To find the number halfway between 23 and 688, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 23 and 688 into our formula, we get:
(23 + 688)/2 = 355.5
Thus, the number halfway between 23 and 688 is 355.5.
To check that our answer is correct, we subtract 23 from 355.5 and subtract 355.5 from 688 and compare the two numbers:
355.5 - 23 = 332.5
688 - 355.5 = 332.5
As you can see, the halfway number is 332.5 higher than 23 and 332.5 lower than 688. Therefore, our halfway between answer of 355.5 above is correct.
Halfway Between
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