When you ask "What number is halfway between 12 and 249?" 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=249.
To find the number halfway between 12 and 249, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 249 into our formula, we get:
(12 + 249)/2 = 130.5
Thus, the number halfway between 12 and 249 is 130.5.
To check that our answer is correct, we subtract 12 from 130.5 and subtract 130.5 from 249 and compare the two numbers:
130.5 - 12 = 118.5
249 - 130.5 = 118.5
As you can see, the halfway number is 118.5 higher than 12 and 118.5 lower than 249. Therefore, our halfway between answer of 130.5 above is correct.
Halfway Between
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Halfway Between 12 and 250
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