When you ask "What number is halfway between 84 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=84 and Y=831.
To find the number halfway between 84 and 831, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 831 into our formula, we get:
(84 + 831)/2 = 457.5
Thus, the number halfway between 84 and 831 is 457.5.
To check that our answer is correct, we subtract 84 from 457.5 and subtract 457.5 from 831 and compare the two numbers:
457.5 - 84 = 373.5
831 - 457.5 = 373.5
As you can see, the halfway number is 373.5 higher than 84 and 373.5 lower than 831. Therefore, our halfway between answer of 457.5 above is correct.
Halfway Between
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Halfway Between 84 and 832
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