When you ask "What number is halfway between 99 and 540?" 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=540.
To find the number halfway between 99 and 540, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 540 into our formula, we get:
(99 + 540)/2 = 319.5
Thus, the number halfway between 99 and 540 is 319.5.
To check that our answer is correct, we subtract 99 from 319.5 and subtract 319.5 from 540 and compare the two numbers:
319.5 - 99 = 220.5
540 - 319.5 = 220.5
As you can see, the halfway number is 220.5 higher than 99 and 220.5 lower than 540. Therefore, our halfway between answer of 319.5 above is correct.
Halfway Between
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Halfway Between 99 and 541
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