When you ask "What number is halfway between 99 and 539?" 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=539.
To find the number halfway between 99 and 539, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 539 into our formula, we get:
(99 + 539)/2 = 319
Thus, the number halfway between 99 and 539 is 319.
To check that our answer is correct, we subtract 99 from 319 and subtract 319 from 539 and compare the two numbers:
319 - 99 = 220
539 - 319 = 220
As you can see, the halfway number is 220 higher than 99 and 220 lower than 539. Therefore, our halfway between answer of 319 above is correct.
Halfway Between
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Halfway Between 99 and 540
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