When you ask "What number is halfway between 99 and 611?" 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=611.
To find the number halfway between 99 and 611, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 611 into our formula, we get:
(99 + 611)/2 = 355
Thus, the number halfway between 99 and 611 is 355.
To check that our answer is correct, we subtract 99 from 355 and subtract 355 from 611 and compare the two numbers:
355 - 99 = 256
611 - 355 = 256
As you can see, the halfway number is 256 higher than 99 and 256 lower than 611. Therefore, our halfway between answer of 355 above is correct.
Halfway Between
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Halfway Between 99 and 612
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