When you ask "What number is halfway between 23 and 686?" 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=686.
To find the number halfway between 23 and 686, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 23 and 686 into our formula, we get:
(23 + 686)/2 = 354.5
Thus, the number halfway between 23 and 686 is 354.5.
To check that our answer is correct, we subtract 23 from 354.5 and subtract 354.5 from 686 and compare the two numbers:
354.5 - 23 = 331.5
686 - 354.5 = 331.5
As you can see, the halfway number is 331.5 higher than 23 and 331.5 lower than 686. Therefore, our halfway between answer of 354.5 above is correct.
Halfway Between
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Halfway Between 23 and 687
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