When you ask "What number is halfway between 31 and 720?" 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=720.
To find the number halfway between 31 and 720, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 720 into our formula, we get:
(31 + 720)/2 = 375.5
Thus, the number halfway between 31 and 720 is 375.5.
To check that our answer is correct, we subtract 31 from 375.5 and subtract 375.5 from 720 and compare the two numbers:
375.5 - 31 = 344.5
720 - 375.5 = 344.5
As you can see, the halfway number is 344.5 higher than 31 and 344.5 lower than 720. Therefore, our halfway between answer of 375.5 above is correct.
Halfway Between
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