When you ask "What number is halfway between 39 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=39 and Y=688.
To find the number halfway between 39 and 688, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 39 and 688 into our formula, we get:
(39 + 688)/2 = 363.5
Thus, the number halfway between 39 and 688 is 363.5.
To check that our answer is correct, we subtract 39 from 363.5 and subtract 363.5 from 688 and compare the two numbers:
363.5 - 39 = 324.5
688 - 363.5 = 324.5
As you can see, the halfway number is 324.5 higher than 39 and 324.5 lower than 688. Therefore, our halfway between answer of 363.5 above is correct.
Halfway Between
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