When you ask "What number is halfway between 11 and 644?" 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=644.
To find the number halfway between 11 and 644, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 644 into our formula, we get:
(11 + 644)/2 = 327.5
Thus, the number halfway between 11 and 644 is 327.5.
To check that our answer is correct, we subtract 11 from 327.5 and subtract 327.5 from 644 and compare the two numbers:
327.5 - 11 = 316.5
644 - 327.5 = 316.5
As you can see, the halfway number is 316.5 higher than 11 and 316.5 lower than 644. Therefore, our halfway between answer of 327.5 above is correct.
Halfway Between
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Halfway Between 11 and 645
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