When you ask "What number is halfway between 18 and 495?" 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=495.
To find the number halfway between 18 and 495, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 495 into our formula, we get:
(18 + 495)/2 = 256.5
Thus, the number halfway between 18 and 495 is 256.5.
To check that our answer is correct, we subtract 18 from 256.5 and subtract 256.5 from 495 and compare the two numbers:
256.5 - 18 = 238.5
495 - 256.5 = 238.5
As you can see, the halfway number is 238.5 higher than 18 and 238.5 lower than 495. Therefore, our halfway between answer of 256.5 above is correct.
Halfway Between
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Halfway Between 18 and 496
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