When you ask "What number is halfway between 89 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=89 and Y=122.
To find the number halfway between 89 and 122, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 89 and 122 into our formula, we get:
(89 + 122)/2 = 105.5
Thus, the number halfway between 89 and 122 is 105.5.
To check that our answer is correct, we subtract 89 from 105.5 and subtract 105.5 from 122 and compare the two numbers:
105.5 - 89 = 16.5
122 - 105.5 = 16.5
As you can see, the halfway number is 16.5 higher than 89 and 16.5 lower than 122. Therefore, our halfway between answer of 105.5 above is correct.
Halfway Between
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Halfway Between 89 and 123
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