When you ask "What number is halfway between 99 and 561?" 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=561.
To find the number halfway between 99 and 561, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 561 into our formula, we get:
(99 + 561)/2 = 330
Thus, the number halfway between 99 and 561 is 330.
To check that our answer is correct, we subtract 99 from 330 and subtract 330 from 561 and compare the two numbers:
330 - 99 = 231
561 - 330 = 231
As you can see, the halfway number is 231 higher than 99 and 231 lower than 561. Therefore, our halfway between answer of 330 above is correct.
Halfway Between
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