When you ask "What number is halfway between 12 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=12 and Y=561.
To find the number halfway between 12 and 561, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 561 into our formula, we get:
(12 + 561)/2 = 286.5
Thus, the number halfway between 12 and 561 is 286.5.
To check that our answer is correct, we subtract 12 from 286.5 and subtract 286.5 from 561 and compare the two numbers:
286.5 - 12 = 274.5
561 - 286.5 = 274.5
As you can see, the halfway number is 274.5 higher than 12 and 274.5 lower than 561. Therefore, our halfway between answer of 286.5 above is correct.
Halfway Between
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Halfway Between 12 and 562
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