When you ask "What number is halfway between 84 and 679?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=84 and Y=679.
To find the number halfway between 84 and 679, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 679 into our formula, we get:
(84 + 679)/2 = 381.5
Thus, the number halfway between 84 and 679 is 381.5.
To check that our answer is correct, we subtract 84 from 381.5 and subtract 381.5 from 679 and compare the two numbers:
381.5 - 84 = 297.5
679 - 381.5 = 297.5
As you can see, the halfway number is 297.5 higher than 84 and 297.5 lower than 679. Therefore, our halfway between answer of 381.5 above is correct.
Halfway Between
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Halfway Between 84 and 680
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