When you ask "What number is halfway between 75 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=75 and Y=688.
To find the number halfway between 75 and 688, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 75 and 688 into our formula, we get:
(75 + 688)/2 = 381.5
Thus, the number halfway between 75 and 688 is 381.5.
To check that our answer is correct, we subtract 75 from 381.5 and subtract 381.5 from 688 and compare the two numbers:
381.5 - 75 = 306.5
688 - 381.5 = 306.5
As you can see, the halfway number is 306.5 higher than 75 and 306.5 lower than 688. Therefore, our halfway between answer of 381.5 above is correct.
Halfway Between
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