When you ask "What number is halfway between 31 and 486?" 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=486.
To find the number halfway between 31 and 486, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 486 into our formula, we get:
(31 + 486)/2 = 258.5
Thus, the number halfway between 31 and 486 is 258.5.
To check that our answer is correct, we subtract 31 from 258.5 and subtract 258.5 from 486 and compare the two numbers:
258.5 - 31 = 227.5
486 - 258.5 = 227.5
As you can see, the halfway number is 227.5 higher than 31 and 227.5 lower than 486. Therefore, our halfway between answer of 258.5 above is correct.
Halfway Between
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Halfway Between 31 and 487
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