When you ask "What number is halfway between 99 and 208?" 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=208.
To find the number halfway between 99 and 208, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 208 into our formula, we get:
(99 + 208)/2 = 153.5
Thus, the number halfway between 99 and 208 is 153.5.
To check that our answer is correct, we subtract 99 from 153.5 and subtract 153.5 from 208 and compare the two numbers:
153.5 - 99 = 54.5
208 - 153.5 = 54.5
As you can see, the halfway number is 54.5 higher than 99 and 54.5 lower than 208. Therefore, our halfway between answer of 153.5 above is correct.
Halfway Between
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