When you ask "What number is halfway between 30 and 647?" 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=647.
To find the number halfway between 30 and 647, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 647 into our formula, we get:
(30 + 647)/2 = 338.5
Thus, the number halfway between 30 and 647 is 338.5.
To check that our answer is correct, we subtract 30 from 338.5 and subtract 338.5 from 647 and compare the two numbers:
338.5 - 30 = 308.5
647 - 338.5 = 308.5
As you can see, the halfway number is 308.5 higher than 30 and 308.5 lower than 647. Therefore, our halfway between answer of 338.5 above is correct.
Halfway Between
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Halfway Between 30 and 648
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