
When you ask "What number is halfway between 90 and 480?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=90 and Y=480.

To find the number halfway between 90 and 480, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 480 into our formula, we get:
(90 + 480)/2 = 285
Thus, the number halfway between 90 and 480 is 285.
To check that our answer is correct, we subtract 90 from 285 and subtract 285 from 480 and compare the two numbers:
285 - 90 = 195
480 - 285 = 195
As you can see, the halfway number is 195 higher than 90 and 195 lower than 480. Therefore, our halfway between answer of 285 above is correct.
Halfway Between
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Halfway Between 90 and 481
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