When you ask "What number is halfway between 18 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=18 and Y=561.
To find the number halfway between 18 and 561, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 561 into our formula, we get:
(18 + 561)/2 = 289.5
Thus, the number halfway between 18 and 561 is 289.5.
To check that our answer is correct, we subtract 18 from 289.5 and subtract 289.5 from 561 and compare the two numbers:
289.5 - 18 = 271.5
561 - 289.5 = 271.5
As you can see, the halfway number is 271.5 higher than 18 and 271.5 lower than 561. Therefore, our halfway between answer of 289.5 above is correct.
Halfway Between
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