When you ask "What number is halfway between 3 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=3 and Y=643.
To find the number halfway between 3 and 643, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 3 and 643 into our formula, we get:
(3 + 643)/2 = 323
Thus, the number halfway between 3 and 643 is 323.
To check that our answer is correct, we subtract 3 from 323 and subtract 323 from 643 and compare the two numbers:
323 - 3 = 320
643 - 323 = 320
As you can see, the halfway number is 320 higher than 3 and 320 lower than 643. Therefore, our halfway between answer of 323 above is correct.
Halfway Between
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Halfway Between 3 and 644
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