When you ask "What number is halfway between 84 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=84 and Y=647.
To find the number halfway between 84 and 647, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 647 into our formula, we get:
(84 + 647)/2 = 365.5
Thus, the number halfway between 84 and 647 is 365.5.
To check that our answer is correct, we subtract 84 from 365.5 and subtract 365.5 from 647 and compare the two numbers:
365.5 - 84 = 281.5
647 - 365.5 = 281.5
As you can see, the halfway number is 281.5 higher than 84 and 281.5 lower than 647. Therefore, our halfway between answer of 365.5 above is correct.
Halfway Between
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Halfway Between 84 and 648
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