When you ask "What number is halfway between 17 and 515?" 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=515.
To find the number halfway between 17 and 515, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 515 into our formula, we get:
(17 + 515)/2 = 266
Thus, the number halfway between 17 and 515 is 266.
To check that our answer is correct, we subtract 17 from 266 and subtract 266 from 515 and compare the two numbers:
266 - 17 = 249
515 - 266 = 249
As you can see, the halfway number is 249 higher than 17 and 249 lower than 515. Therefore, our halfway between answer of 266 above is correct.
Halfway Between
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Halfway Between 17 and 516
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