When you ask "What number is halfway between 100 and 831?" 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=831.
To find the number halfway between 100 and 831, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 831 into our formula, we get:
(100 + 831)/2 = 465.5
Thus, the number halfway between 100 and 831 is 465.5.
To check that our answer is correct, we subtract 100 from 465.5 and subtract 465.5 from 831 and compare the two numbers:
465.5 - 100 = 365.5
831 - 465.5 = 365.5
As you can see, the halfway number is 365.5 higher than 100 and 365.5 lower than 831. Therefore, our halfway between answer of 465.5 above is correct.
Halfway Between
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Halfway Between 100 and 832
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