When you ask "What number is halfway between 4 and 31?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=4 and Y=31.
To find the number halfway between 4 and 31, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 31 into our formula, we get:
(4 + 31)/2 = 17.5
Thus, the number halfway between 4 and 31 is 17.5.
To check that our answer is correct, we subtract 4 from 17.5 and subtract 17.5 from 31 and compare the two numbers:
17.5 - 4 = 13.5
31 - 17.5 = 13.5
As you can see, the halfway number is 13.5 higher than 4 and 13.5 lower than 31. Therefore, our halfway between answer of 17.5 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 4 and 32
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