When you ask "What number is halfway between 99 and 990?" 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=990.
To find the number halfway between 99 and 990, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 990 into our formula, we get:
(99 + 990)/2 = 544.5
Thus, the number halfway between 99 and 990 is 544.5.
To check that our answer is correct, we subtract 99 from 544.5 and subtract 544.5 from 990 and compare the two numbers:
544.5 - 99 = 445.5
990 - 544.5 = 445.5
As you can see, the halfway number is 445.5 higher than 99 and 445.5 lower than 990. Therefore, our halfway between answer of 544.5 above is correct.
Halfway Between
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Halfway Between 99 and 991
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