When you ask "What number is halfway between 12 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=12 and Y=831.
To find the number halfway between 12 and 831, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 831 into our formula, we get:
(12 + 831)/2 = 421.5
Thus, the number halfway between 12 and 831 is 421.5.
To check that our answer is correct, we subtract 12 from 421.5 and subtract 421.5 from 831 and compare the two numbers:
421.5 - 12 = 409.5
831 - 421.5 = 409.5
As you can see, the halfway number is 409.5 higher than 12 and 409.5 lower than 831. Therefore, our halfway between answer of 421.5 above is correct.
Halfway Between
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Halfway Between 12 and 832
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