When you ask "What number is halfway between 84 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=84 and Y=490.
To find the number halfway between 84 and 490, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 490 into our formula, we get:
(84 + 490)/2 = 287
Thus, the number halfway between 84 and 490 is 287.
To check that our answer is correct, we subtract 84 from 287 and subtract 287 from 490 and compare the two numbers:
287 - 84 = 203
490 - 287 = 203
As you can see, the halfway number is 203 higher than 84 and 203 lower than 490. Therefore, our halfway between answer of 287 above is correct.
Halfway Between
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Halfway Between 84 and 491
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