When you ask "What number is halfway between 31 and 850?" 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=850.
To find the number halfway between 31 and 850, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 850 into our formula, we get:
(31 + 850)/2 = 440.5
Thus, the number halfway between 31 and 850 is 440.5.
To check that our answer is correct, we subtract 31 from 440.5 and subtract 440.5 from 850 and compare the two numbers:
440.5 - 31 = 409.5
850 - 440.5 = 409.5
As you can see, the halfway number is 409.5 higher than 31 and 409.5 lower than 850. Therefore, our halfway between answer of 440.5 above is correct.
Halfway Between
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