When you ask "What number is halfway between 7 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=7 and Y=688.
To find the number halfway between 7 and 688, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 688 into our formula, we get:
(7 + 688)/2 = 347.5
Thus, the number halfway between 7 and 688 is 347.5.
To check that our answer is correct, we subtract 7 from 347.5 and subtract 347.5 from 688 and compare the two numbers:
347.5 - 7 = 340.5
688 - 347.5 = 340.5
As you can see, the halfway number is 340.5 higher than 7 and 340.5 lower than 688. Therefore, our halfway between answer of 347.5 above is correct.
Halfway Between
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