When you ask "What number is halfway between 85 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=85 and Y=686.
To find the number halfway between 85 and 686, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 85 and 686 into our formula, we get:
(85 + 686)/2 = 385.5
Thus, the number halfway between 85 and 686 is 385.5.
To check that our answer is correct, we subtract 85 from 385.5 and subtract 385.5 from 686 and compare the two numbers:
385.5 - 85 = 300.5
686 - 385.5 = 300.5
As you can see, the halfway number is 300.5 higher than 85 and 300.5 lower than 686. Therefore, our halfway between answer of 385.5 above is correct.
Halfway Between
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Halfway Between 85 and 687
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