When you ask "What number is halfway between 30 and 645?" 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=645.
To find the number halfway between 30 and 645, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 645 into our formula, we get:
(30 + 645)/2 = 337.5
Thus, the number halfway between 30 and 645 is 337.5.
To check that our answer is correct, we subtract 30 from 337.5 and subtract 337.5 from 645 and compare the two numbers:
337.5 - 30 = 307.5
645 - 337.5 = 307.5
As you can see, the halfway number is 307.5 higher than 30 and 307.5 lower than 645. Therefore, our halfway between answer of 337.5 above is correct.
Halfway Between
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Halfway Between 30 and 646
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