When you ask "What number is halfway between 10 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=10 and Y=99.
To find the number halfway between 10 and 99, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 99 into our formula, we get:
(10 + 99)/2 = 54.5
Thus, the number halfway between 10 and 99 is 54.5.
To check that our answer is correct, we subtract 10 from 54.5 and subtract 54.5 from 99 and compare the two numbers:
54.5 - 10 = 44.5
99 - 54.5 = 44.5
As you can see, the halfway number is 44.5 higher than 10 and 44.5 lower than 99. Therefore, our halfway between answer of 54.5 above is correct.
Halfway Between
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Halfway Between 10 and 100
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