When you ask "What number is halfway between 10 and 687?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=10 and Y=687.
To find the number halfway between 10 and 687, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 687 into our formula, we get:
(10 + 687)/2 = 348.5
Thus, the number halfway between 10 and 687 is 348.5.
To check that our answer is correct, we subtract 10 from 348.5 and subtract 348.5 from 687 and compare the two numbers:
348.5 - 10 = 338.5
687 - 348.5 = 338.5
As you can see, the halfway number is 338.5 higher than 10 and 338.5 lower than 687. Therefore, our halfway between answer of 348.5 above is correct.
Halfway Between
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Halfway Between 10 and 688
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