When you ask "What number is halfway between 31 and 490?" 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=490.
To find the number halfway between 31 and 490, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 490 into our formula, we get:
(31 + 490)/2 = 260.5
Thus, the number halfway between 31 and 490 is 260.5.
To check that our answer is correct, we subtract 31 from 260.5 and subtract 260.5 from 490 and compare the two numbers:
260.5 - 31 = 229.5
490 - 260.5 = 229.5
As you can see, the halfway number is 229.5 higher than 31 and 229.5 lower than 490. Therefore, our halfway between answer of 260.5 above is correct.
Halfway Between
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Halfway Between 31 and 491
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