When you ask "What number is halfway between 12 and 787?" 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=787.
To find the number halfway between 12 and 787, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 787 into our formula, we get:
(12 + 787)/2 = 399.5
Thus, the number halfway between 12 and 787 is 399.5.
To check that our answer is correct, we subtract 12 from 399.5 and subtract 399.5 from 787 and compare the two numbers:
399.5 - 12 = 387.5
787 - 399.5 = 387.5
As you can see, the halfway number is 387.5 higher than 12 and 387.5 lower than 787. Therefore, our halfway between answer of 399.5 above is correct.
Halfway Between
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Halfway Between 12 and 788
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