When you ask "What number is halfway between 17 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=17 and Y=490.
To find the number halfway between 17 and 490, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 490 into our formula, we get:
(17 + 490)/2 = 253.5
Thus, the number halfway between 17 and 490 is 253.5.
To check that our answer is correct, we subtract 17 from 253.5 and subtract 253.5 from 490 and compare the two numbers:
253.5 - 17 = 236.5
490 - 253.5 = 236.5
As you can see, the halfway number is 236.5 higher than 17 and 236.5 lower than 490. Therefore, our halfway between answer of 253.5 above is correct.
Halfway Between
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Halfway Between 17 and 491
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