When you ask "What number is halfway between 31 and 872?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=31 and Y=872.
To find the number halfway between 31 and 872, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 872 into our formula, we get:
(31 + 872)/2 = 451.5
Thus, the number halfway between 31 and 872 is 451.5.
To check that our answer is correct, we subtract 31 from 451.5 and subtract 451.5 from 872 and compare the two numbers:
451.5 - 31 = 420.5
872 - 451.5 = 420.5
As you can see, the halfway number is 420.5 higher than 31 and 420.5 lower than 872. Therefore, our halfway between answer of 451.5 above is correct.
Halfway Between
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Halfway Between 31 and 873
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