When you ask "What number is halfway between 6 and 645?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=6 and Y=645.
To find the number halfway between 6 and 645, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 6 and 645 into our formula, we get:
(6 + 645)/2 = 325.5
Thus, the number halfway between 6 and 645 is 325.5.
To check that our answer is correct, we subtract 6 from 325.5 and subtract 325.5 from 645 and compare the two numbers:
325.5 - 6 = 319.5
645 - 325.5 = 319.5
As you can see, the halfway number is 319.5 higher than 6 and 319.5 lower than 645. Therefore, our halfway between answer of 325.5 above is correct.
Halfway Between
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Halfway Between 6 and 646
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