When you ask "What number is halfway between 100 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=100 and Y=679.
To find the number halfway between 100 and 679, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 679 into our formula, we get:
(100 + 679)/2 = 389.5
Thus, the number halfway between 100 and 679 is 389.5.
To check that our answer is correct, we subtract 100 from 389.5 and subtract 389.5 from 679 and compare the two numbers:
389.5 - 100 = 289.5
679 - 389.5 = 289.5
As you can see, the halfway number is 289.5 higher than 100 and 289.5 lower than 679. Therefore, our halfway between answer of 389.5 above is correct.
Halfway Between
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Halfway Between 100 and 680
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