When you ask "What number is halfway between 58 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=58 and Y=643.
To find the number halfway between 58 and 643, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 58 and 643 into our formula, we get:
(58 + 643)/2 = 350.5
Thus, the number halfway between 58 and 643 is 350.5.
To check that our answer is correct, we subtract 58 from 350.5 and subtract 350.5 from 643 and compare the two numbers:
350.5 - 58 = 292.5
643 - 350.5 = 292.5
As you can see, the halfway number is 292.5 higher than 58 and 292.5 lower than 643. Therefore, our halfway between answer of 350.5 above is correct.
Halfway Between
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Halfway Between 58 and 644
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