When you ask "What number is halfway between 18 and 663?" 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=663.
To find the number halfway between 18 and 663, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 663 into our formula, we get:
(18 + 663)/2 = 340.5
Thus, the number halfway between 18 and 663 is 340.5.
To check that our answer is correct, we subtract 18 from 340.5 and subtract 340.5 from 663 and compare the two numbers:
340.5 - 18 = 322.5
663 - 340.5 = 322.5
As you can see, the halfway number is 322.5 higher than 18 and 322.5 lower than 663. Therefore, our halfway between answer of 340.5 above is correct.
Halfway Between
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Halfway Between 18 and 664
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