When you ask "What number is halfway between 10 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=10 and Y=831.
To find the number halfway between 10 and 831, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 831 into our formula, we get:
(10 + 831)/2 = 420.5
Thus, the number halfway between 10 and 831 is 420.5.
To check that our answer is correct, we subtract 10 from 420.5 and subtract 420.5 from 831 and compare the two numbers:
420.5 - 10 = 410.5
831 - 420.5 = 410.5
As you can see, the halfway number is 410.5 higher than 10 and 410.5 lower than 831. Therefore, our halfway between answer of 420.5 above is correct.
Halfway Between
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Halfway Between 10 and 832
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