When you ask "What number is halfway between 99 and 900?" 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=900.
To find the number halfway between 99 and 900, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 900 into our formula, we get:
(99 + 900)/2 = 499.5
Thus, the number halfway between 99 and 900 is 499.5.
To check that our answer is correct, we subtract 99 from 499.5 and subtract 499.5 from 900 and compare the two numbers:
499.5 - 99 = 400.5
900 - 499.5 = 400.5
As you can see, the halfway number is 400.5 higher than 99 and 400.5 lower than 900. Therefore, our halfway between answer of 499.5 above is correct.
Halfway Between
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