When you ask "What number is halfway between 99 and 530?" 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=530.
To find the number halfway between 99 and 530, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 530 into our formula, we get:
(99 + 530)/2 = 314.5
Thus, the number halfway between 99 and 530 is 314.5.
To check that our answer is correct, we subtract 99 from 314.5 and subtract 314.5 from 530 and compare the two numbers:
314.5 - 99 = 215.5
530 - 314.5 = 215.5
As you can see, the halfway number is 215.5 higher than 99 and 215.5 lower than 530. Therefore, our halfway between answer of 314.5 above is correct.
Halfway Between
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Halfway Between 99 and 531
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