When you ask "What number is halfway between 81 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=81 and Y=490.
To find the number halfway between 81 and 490, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 490 into our formula, we get:
(81 + 490)/2 = 285.5
Thus, the number halfway between 81 and 490 is 285.5.
To check that our answer is correct, we subtract 81 from 285.5 and subtract 285.5 from 490 and compare the two numbers:
285.5 - 81 = 204.5
490 - 285.5 = 204.5
As you can see, the halfway number is 204.5 higher than 81 and 204.5 lower than 490. Therefore, our halfway between answer of 285.5 above is correct.
Halfway Between
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Halfway Between 81 and 491
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