When you ask "What number is halfway between 30 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=30 and Y=831.
To find the number halfway between 30 and 831, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 831 into our formula, we get:
(30 + 831)/2 = 430.5
Thus, the number halfway between 30 and 831 is 430.5.
To check that our answer is correct, we subtract 30 from 430.5 and subtract 430.5 from 831 and compare the two numbers:
430.5 - 30 = 400.5
831 - 430.5 = 400.5
As you can see, the halfway number is 400.5 higher than 30 and 400.5 lower than 831. Therefore, our halfway between answer of 430.5 above is correct.
Halfway Between
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Halfway Between 30 and 832
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