When you ask "What number is halfway between 99 and 324?" 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=324.
To find the number halfway between 99 and 324, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 324 into our formula, we get:
(99 + 324)/2 = 211.5
Thus, the number halfway between 99 and 324 is 211.5.
To check that our answer is correct, we subtract 99 from 211.5 and subtract 211.5 from 324 and compare the two numbers:
211.5 - 99 = 112.5
324 - 211.5 = 112.5
As you can see, the halfway number is 112.5 higher than 99 and 112.5 lower than 324. Therefore, our halfway between answer of 211.5 above is correct.
Halfway Between
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Halfway Between 99 and 325
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