When you ask "What number is halfway between 12 and 289?" 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=289.
To find the number halfway between 12 and 289, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 289 into our formula, we get:
(12 + 289)/2 = 150.5
Thus, the number halfway between 12 and 289 is 150.5.
To check that our answer is correct, we subtract 12 from 150.5 and subtract 150.5 from 289 and compare the two numbers:
150.5 - 12 = 138.5
289 - 150.5 = 138.5
As you can see, the halfway number is 138.5 higher than 12 and 138.5 lower than 289. Therefore, our halfway between answer of 150.5 above is correct.
Halfway Between
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Halfway Between 12 and 290
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