When you ask "What number is halfway between 17 and 260?" 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=260.
To find the number halfway between 17 and 260, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 260 into our formula, we get:
(17 + 260)/2 = 138.5
Thus, the number halfway between 17 and 260 is 138.5.
To check that our answer is correct, we subtract 17 from 138.5 and subtract 138.5 from 260 and compare the two numbers:
138.5 - 17 = 121.5
260 - 138.5 = 121.5
As you can see, the halfway number is 121.5 higher than 17 and 121.5 lower than 260. Therefore, our halfway between answer of 138.5 above is correct.
Halfway Between
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Halfway Between 17 and 261
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