When you ask "What number is halfway between 18 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=18 and Y=645.
To find the number halfway between 18 and 645, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 645 into our formula, we get:
(18 + 645)/2 = 331.5
Thus, the number halfway between 18 and 645 is 331.5.
To check that our answer is correct, we subtract 18 from 331.5 and subtract 331.5 from 645 and compare the two numbers:
331.5 - 18 = 313.5
645 - 331.5 = 313.5
As you can see, the halfway number is 313.5 higher than 18 and 313.5 lower than 645. Therefore, our halfway between answer of 331.5 above is correct.
Halfway Between
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Halfway Between 18 and 646
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