When you ask "What number is halfway between 13 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=13 and Y=646.
To find the number halfway between 13 and 646, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 13 and 646 into our formula, we get:
(13 + 646)/2 = 329.5
Thus, the number halfway between 13 and 646 is 329.5.
To check that our answer is correct, we subtract 13 from 329.5 and subtract 329.5 from 646 and compare the two numbers:
329.5 - 13 = 316.5
646 - 329.5 = 316.5
As you can see, the halfway number is 316.5 higher than 13 and 316.5 lower than 646. Therefore, our halfway between answer of 329.5 above is correct.
Halfway Between
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Halfway Between 13 and 647
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