When you ask "What number is halfway between 17 and 285?" 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=285.
To find the number halfway between 17 and 285, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 285 into our formula, we get:
(17 + 285)/2 = 151
Thus, the number halfway between 17 and 285 is 151.
To check that our answer is correct, we subtract 17 from 151 and subtract 151 from 285 and compare the two numbers:
151 - 17 = 134
285 - 151 = 134
As you can see, the halfway number is 134 higher than 17 and 134 lower than 285. Therefore, our halfway between answer of 151 above is correct.
Halfway Between
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Halfway Between 17 and 286
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