When you ask "What number is halfway between 17 and 493?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=17 and Y=493.
To find the number halfway between 17 and 493, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 493 into our formula, we get:
(17 + 493)/2 = 255
Thus, the number halfway between 17 and 493 is 255.
To check that our answer is correct, we subtract 17 from 255 and subtract 255 from 493 and compare the two numbers:
255 - 17 = 238
493 - 255 = 238
As you can see, the halfway number is 238 higher than 17 and 238 lower than 493. Therefore, our halfway between answer of 255 above is correct.
Halfway Between
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Halfway Between 17 and 494
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