When you ask "What number is halfway between 1 and 646?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=1 and Y=646.
To find the number halfway between 1 and 646, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 1 and 646 into our formula, we get:
(1 + 646)/2 = 323.5
Thus, the number halfway between 1 and 646 is 323.5.
To check that our answer is correct, we subtract 1 from 323.5 and subtract 323.5 from 646 and compare the two numbers:
323.5 - 1 = 322.5
646 - 323.5 = 322.5
As you can see, the halfway number is 322.5 higher than 1 and 322.5 lower than 646. Therefore, our halfway between answer of 323.5 above is correct.
Halfway Between
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Halfway Between 1 and 647
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