When you ask "What number is halfway between 9 and 99?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=9 and Y=99.
To find the number halfway between 9 and 99, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 99 into our formula, we get:
(9 + 99)/2 = 54
Thus, the number halfway between 9 and 99 is 54.
To check that our answer is correct, we subtract 9 from 54 and subtract 54 from 99 and compare the two numbers:
54 - 9 = 45
99 - 54 = 45
As you can see, the halfway number is 45 higher than 9 and 45 lower than 99. Therefore, our halfway between answer of 54 above is correct.
Halfway Between
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Halfway Between 9 and 100
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