When you ask "What number is halfway between 2 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=2 and Y=490.
To find the number halfway between 2 and 490, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 2 and 490 into our formula, we get:
(2 + 490)/2 = 246
Thus, the number halfway between 2 and 490 is 246.
To check that our answer is correct, we subtract 2 from 246 and subtract 246 from 490 and compare the two numbers:
246 - 2 = 244
490 - 246 = 244
As you can see, the halfway number is 244 higher than 2 and 244 lower than 490. Therefore, our halfway between answer of 246 above is correct.
Halfway Between
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Halfway Between 2 and 491
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