When you ask "What number is halfway between 3 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=3 and Y=644.
To find the number halfway between 3 and 644, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 3 and 644 into our formula, we get:
(3 + 644)/2 = 323.5
Thus, the number halfway between 3 and 644 is 323.5.
To check that our answer is correct, we subtract 3 from 323.5 and subtract 323.5 from 644 and compare the two numbers:
323.5 - 3 = 320.5
644 - 323.5 = 320.5
As you can see, the halfway number is 320.5 higher than 3 and 320.5 lower than 644. Therefore, our halfway between answer of 323.5 above is correct.
Halfway Between
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Halfway Between 3 and 645
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