When you ask "What number is halfway between 100 and 579?" 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=579.
To find the number halfway between 100 and 579, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 579 into our formula, we get:
(100 + 579)/2 = 339.5
Thus, the number halfway between 100 and 579 is 339.5.
To check that our answer is correct, we subtract 100 from 339.5 and subtract 339.5 from 579 and compare the two numbers:
339.5 - 100 = 239.5
579 - 339.5 = 239.5
As you can see, the halfway number is 239.5 higher than 100 and 239.5 lower than 579. Therefore, our halfway between answer of 339.5 above is correct.
Halfway Between
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