When you ask "What number is halfway between 13 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=13 and Y=490.
To find the number halfway between 13 and 490, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 13 and 490 into our formula, we get:
(13 + 490)/2 = 251.5
Thus, the number halfway between 13 and 490 is 251.5.
To check that our answer is correct, we subtract 13 from 251.5 and subtract 251.5 from 490 and compare the two numbers:
251.5 - 13 = 238.5
490 - 251.5 = 238.5
As you can see, the halfway number is 238.5 higher than 13 and 238.5 lower than 490. Therefore, our halfway between answer of 251.5 above is correct.
Halfway Between
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Halfway Between 13 and 491
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