When you ask "What number is halfway between 99 and 512?" 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=512.
To find the number halfway between 99 and 512, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 512 into our formula, we get:
(99 + 512)/2 = 305.5
Thus, the number halfway between 99 and 512 is 305.5.
To check that our answer is correct, we subtract 99 from 305.5 and subtract 305.5 from 512 and compare the two numbers:
305.5 - 99 = 206.5
512 - 305.5 = 206.5
As you can see, the halfway number is 206.5 higher than 99 and 206.5 lower than 512. Therefore, our halfway between answer of 305.5 above is correct.
Halfway Between
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Halfway Between 99 and 513
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