When you ask "What number is halfway between 30 and 617?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=30 and Y=617.
To find the number halfway between 30 and 617, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 617 into our formula, we get:
(30 + 617)/2 = 323.5
Thus, the number halfway between 30 and 617 is 323.5.
To check that our answer is correct, we subtract 30 from 323.5 and subtract 323.5 from 617 and compare the two numbers:
323.5 - 30 = 293.5
617 - 323.5 = 293.5
As you can see, the halfway number is 293.5 higher than 30 and 293.5 lower than 617. Therefore, our halfway between answer of 323.5 above is correct.
Halfway Between
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Halfway Between 30 and 618
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