When you ask "What number is halfway between 12 and 387?" 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=387.
To find the number halfway between 12 and 387, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 387 into our formula, we get:
(12 + 387)/2 = 199.5
Thus, the number halfway between 12 and 387 is 199.5.
To check that our answer is correct, we subtract 12 from 199.5 and subtract 199.5 from 387 and compare the two numbers:
199.5 - 12 = 187.5
387 - 199.5 = 187.5
As you can see, the halfway number is 187.5 higher than 12 and 187.5 lower than 387. Therefore, our halfway between answer of 199.5 above is correct.
Halfway Between
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Halfway Between 12 and 388
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