When you ask "What number is halfway between 48 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=48 and Y=643.
To find the number halfway between 48 and 643, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 48 and 643 into our formula, we get:
(48 + 643)/2 = 345.5
Thus, the number halfway between 48 and 643 is 345.5.
To check that our answer is correct, we subtract 48 from 345.5 and subtract 345.5 from 643 and compare the two numbers:
345.5 - 48 = 297.5
643 - 345.5 = 297.5
As you can see, the halfway number is 297.5 higher than 48 and 297.5 lower than 643. Therefore, our halfway between answer of 345.5 above is correct.
Halfway Between
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Halfway Between 48 and 644
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