When you ask "What number is halfway between 99 and 412?" 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=412.
To find the number halfway between 99 and 412, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 412 into our formula, we get:
(99 + 412)/2 = 255.5
Thus, the number halfway between 99 and 412 is 255.5.
To check that our answer is correct, we subtract 99 from 255.5 and subtract 255.5 from 412 and compare the two numbers:
255.5 - 99 = 156.5
412 - 255.5 = 156.5
As you can see, the halfway number is 156.5 higher than 99 and 156.5 lower than 412. Therefore, our halfway between answer of 255.5 above is correct.
Halfway Between
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Halfway Between 99 and 413
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