When you ask "What number is halfway between 11 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=11 and Y=646.
To find the number halfway between 11 and 646, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 646 into our formula, we get:
(11 + 646)/2 = 328.5
Thus, the number halfway between 11 and 646 is 328.5.
To check that our answer is correct, we subtract 11 from 328.5 and subtract 328.5 from 646 and compare the two numbers:
328.5 - 11 = 317.5
646 - 328.5 = 317.5
As you can see, the halfway number is 317.5 higher than 11 and 317.5 lower than 646. Therefore, our halfway between answer of 328.5 above is correct.
Halfway Between
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Halfway Between 11 and 647
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