When you ask "What number is halfway between 17 and 122?" 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=122.
To find the number halfway between 17 and 122, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 122 into our formula, we get:
(17 + 122)/2 = 69.5
Thus, the number halfway between 17 and 122 is 69.5.
To check that our answer is correct, we subtract 17 from 69.5 and subtract 69.5 from 122 and compare the two numbers:
69.5 - 17 = 52.5
122 - 69.5 = 52.5
As you can see, the halfway number is 52.5 higher than 17 and 52.5 lower than 122. Therefore, our halfway between answer of 69.5 above is correct.
Halfway Between
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Halfway Between 17 and 123
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