When you ask "What number is halfway between 30 and 625?" 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=625.
To find the number halfway between 30 and 625, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 625 into our formula, we get:
(30 + 625)/2 = 327.5
Thus, the number halfway between 30 and 625 is 327.5.
To check that our answer is correct, we subtract 30 from 327.5 and subtract 327.5 from 625 and compare the two numbers:
327.5 - 30 = 297.5
625 - 327.5 = 297.5
As you can see, the halfway number is 297.5 higher than 30 and 297.5 lower than 625. Therefore, our halfway between answer of 327.5 above is correct.
Halfway Between
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Halfway Between 30 and 626
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