When you ask "What number is halfway between 18 and 648?" 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=648.
To find the number halfway between 18 and 648, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 648 into our formula, we get:
(18 + 648)/2 = 333
Thus, the number halfway between 18 and 648 is 333.
To check that our answer is correct, we subtract 18 from 333 and subtract 333 from 648 and compare the two numbers:
333 - 18 = 315
648 - 333 = 315
As you can see, the halfway number is 315 higher than 18 and 315 lower than 648. Therefore, our halfway between answer of 333 above is correct.
Halfway Between
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Halfway Between 18 and 649
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