When you ask "What number is halfway between 42 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=42 and Y=831.
To find the number halfway between 42 and 831, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 831 into our formula, we get:
(42 + 831)/2 = 436.5
Thus, the number halfway between 42 and 831 is 436.5.
To check that our answer is correct, we subtract 42 from 436.5 and subtract 436.5 from 831 and compare the two numbers:
436.5 - 42 = 394.5
831 - 436.5 = 394.5
As you can see, the halfway number is 394.5 higher than 42 and 394.5 lower than 831. Therefore, our halfway between answer of 436.5 above is correct.
Halfway Between
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Halfway Between 42 and 832
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