When you ask "What number is halfway between 15 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=15 and Y=490.
To find the number halfway between 15 and 490, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 490 into our formula, we get:
(15 + 490)/2 = 252.5
Thus, the number halfway between 15 and 490 is 252.5.
To check that our answer is correct, we subtract 15 from 252.5 and subtract 252.5 from 490 and compare the two numbers:
252.5 - 15 = 237.5
490 - 252.5 = 237.5
As you can see, the halfway number is 237.5 higher than 15 and 237.5 lower than 490. Therefore, our halfway between answer of 252.5 above is correct.
Halfway Between
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Halfway Between 15 and 491
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