When you ask "What number is halfway between 100 and 239?" 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=239.
To find the number halfway between 100 and 239, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 239 into our formula, we get:
(100 + 239)/2 = 169.5
Thus, the number halfway between 100 and 239 is 169.5.
To check that our answer is correct, we subtract 100 from 169.5 and subtract 169.5 from 239 and compare the two numbers:
169.5 - 100 = 69.5
239 - 169.5 = 69.5
As you can see, the halfway number is 69.5 higher than 100 and 69.5 lower than 239. Therefore, our halfway between answer of 169.5 above is correct.
Halfway Between
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Halfway Between 100 and 240
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