When you ask "What number is halfway between 11 and 12?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=11 and Y=12.
To find the number halfway between 11 and 12, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 12 into our formula, we get:
(11 + 12)/2 = 11.5
Thus, the number halfway between 11 and 12 is 11.5.
To check that our answer is correct, we subtract 11 from 11.5 and subtract 11.5 from 12 and compare the two numbers:
11.5 - 11 = 0.5
12 - 11.5 = 0.5
As you can see, the halfway number is 0.5 higher than 11 and 0.5 lower than 12. Therefore, our halfway between answer of 11.5 above is correct.
Halfway Between
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