When you ask "What number is halfway between 79 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=79 and Y=688.
To find the number halfway between 79 and 688, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 79 and 688 into our formula, we get:
(79 + 688)/2 = 383.5
Thus, the number halfway between 79 and 688 is 383.5.
To check that our answer is correct, we subtract 79 from 383.5 and subtract 383.5 from 688 and compare the two numbers:
383.5 - 79 = 304.5
688 - 383.5 = 304.5
As you can see, the halfway number is 304.5 higher than 79 and 304.5 lower than 688. Therefore, our halfway between answer of 383.5 above is correct.
Halfway Between
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