When you ask "What number is halfway between 99 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=99 and Y=490.
To find the number halfway between 99 and 490, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 490 into our formula, we get:
(99 + 490)/2 = 294.5
Thus, the number halfway between 99 and 490 is 294.5.
To check that our answer is correct, we subtract 99 from 294.5 and subtract 294.5 from 490 and compare the two numbers:
294.5 - 99 = 195.5
490 - 294.5 = 195.5
As you can see, the halfway number is 195.5 higher than 99 and 195.5 lower than 490. Therefore, our halfway between answer of 294.5 above is correct.
Halfway Between
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Halfway Between 99 and 491
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