When you ask "What number is halfway between 99 and 528?" 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=528.
To find the number halfway between 99 and 528, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 528 into our formula, we get:
(99 + 528)/2 = 313.5
Thus, the number halfway between 99 and 528 is 313.5.
To check that our answer is correct, we subtract 99 from 313.5 and subtract 313.5 from 528 and compare the two numbers:
313.5 - 99 = 214.5
528 - 313.5 = 214.5
As you can see, the halfway number is 214.5 higher than 99 and 214.5 lower than 528. Therefore, our halfway between answer of 313.5 above is correct.
Halfway Between
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Halfway Between 99 and 529
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