When you ask "What number is halfway between 100 and 709?" 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=709.
To find the number halfway between 100 and 709, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 709 into our formula, we get:
(100 + 709)/2 = 404.5
Thus, the number halfway between 100 and 709 is 404.5.
To check that our answer is correct, we subtract 100 from 404.5 and subtract 404.5 from 709 and compare the two numbers:
404.5 - 100 = 304.5
709 - 404.5 = 304.5
As you can see, the halfway number is 304.5 higher than 100 and 304.5 lower than 709. Therefore, our halfway between answer of 404.5 above is correct.
Halfway Between
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Halfway Between 100 and 710
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