When you ask "What number is halfway between 99 and 564?" 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=564.
To find the number halfway between 99 and 564, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 564 into our formula, we get:
(99 + 564)/2 = 331.5
Thus, the number halfway between 99 and 564 is 331.5.
To check that our answer is correct, we subtract 99 from 331.5 and subtract 331.5 from 564 and compare the two numbers:
331.5 - 99 = 232.5
564 - 331.5 = 232.5
As you can see, the halfway number is 232.5 higher than 99 and 232.5 lower than 564. Therefore, our halfway between answer of 331.5 above is correct.
Halfway Between
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Halfway Between 99 and 565
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