When you ask "What number is halfway between 18 and 655?" 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=655.
To find the number halfway between 18 and 655, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 655 into our formula, we get:
(18 + 655)/2 = 336.5
Thus, the number halfway between 18 and 655 is 336.5.
To check that our answer is correct, we subtract 18 from 336.5 and subtract 336.5 from 655 and compare the two numbers:
336.5 - 18 = 318.5
655 - 336.5 = 318.5
As you can see, the halfway number is 318.5 higher than 18 and 318.5 lower than 655. Therefore, our halfway between answer of 336.5 above is correct.
Halfway Between
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Halfway Between 18 and 656
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