When you ask "What number is halfway between 68 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=68 and Y=643.
To find the number halfway between 68 and 643, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 68 and 643 into our formula, we get:
(68 + 643)/2 = 355.5
Thus, the number halfway between 68 and 643 is 355.5.
To check that our answer is correct, we subtract 68 from 355.5 and subtract 355.5 from 643 and compare the two numbers:
355.5 - 68 = 287.5
643 - 355.5 = 287.5
As you can see, the halfway number is 287.5 higher than 68 and 287.5 lower than 643. Therefore, our halfway between answer of 355.5 above is correct.
Halfway Between
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Halfway Between 68 and 644
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