When you ask "What number is halfway between 12 and 647?" 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=647.
To find the number halfway between 12 and 647, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 647 into our formula, we get:
(12 + 647)/2 = 329.5
Thus, the number halfway between 12 and 647 is 329.5.
To check that our answer is correct, we subtract 12 from 329.5 and subtract 329.5 from 647 and compare the two numbers:
329.5 - 12 = 317.5
647 - 329.5 = 317.5
As you can see, the halfway number is 317.5 higher than 12 and 317.5 lower than 647. Therefore, our halfway between answer of 329.5 above is correct.
Halfway Between
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Halfway Between 12 and 648
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