When you ask "What number is halfway between 18 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=18 and Y=679.
To find the number halfway between 18 and 679, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 679 into our formula, we get:
(18 + 679)/2 = 348.5
Thus, the number halfway between 18 and 679 is 348.5.
To check that our answer is correct, we subtract 18 from 348.5 and subtract 348.5 from 679 and compare the two numbers:
348.5 - 18 = 330.5
679 - 348.5 = 330.5
As you can see, the halfway number is 330.5 higher than 18 and 330.5 lower than 679. Therefore, our halfway between answer of 348.5 above is correct.
Halfway Between
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Halfway Between 18 and 680
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