When you ask "What number is halfway between 31 and 42?" 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=42.
To find the number halfway between 31 and 42, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 42 into our formula, we get:
(31 + 42)/2 = 36.5
Thus, the number halfway between 31 and 42 is 36.5.
To check that our answer is correct, we subtract 31 from 36.5 and subtract 36.5 from 42 and compare the two numbers:
36.5 - 31 = 5.5
42 - 36.5 = 5.5
As you can see, the halfway number is 5.5 higher than 31 and 5.5 lower than 42. Therefore, our halfway between answer of 36.5 above is correct.
Halfway Between
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