When you ask "What number is halfway between 31 and 54?" 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=54.
To find the number halfway between 31 and 54, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 54 into our formula, we get:
(31 + 54)/2 = 42.5
Thus, the number halfway between 31 and 54 is 42.5.
To check that our answer is correct, we subtract 31 from 42.5 and subtract 42.5 from 54 and compare the two numbers:
42.5 - 31 = 11.5
54 - 42.5 = 11.5
As you can see, the halfway number is 11.5 higher than 31 and 11.5 lower than 54. Therefore, our halfway between answer of 42.5 above is correct.
Halfway Between
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Halfway Between 31 and 55
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