When you ask "What number is halfway between 4 and 643?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=4 and Y=643.
To find the number halfway between 4 and 643, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 643 into our formula, we get:
(4 + 643)/2 = 323.5
Thus, the number halfway between 4 and 643 is 323.5.
To check that our answer is correct, we subtract 4 from 323.5 and subtract 323.5 from 643 and compare the two numbers:
323.5 - 4 = 319.5
643 - 323.5 = 319.5
As you can see, the halfway number is 319.5 higher than 4 and 319.5 lower than 643. Therefore, our halfway between answer of 323.5 above is correct.
Halfway Between
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Halfway Between 4 and 644
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